From 2e09b1dc96a5f2aafef88743cc34320517bc7779 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Tue, 22 Jul 2025 10:04:55 +0900
Subject: [PATCH 01/11] Remove undocumented `#conj` and `#conjugate`

---
 core/complex.rbs             |  4 ++--
 core/float.rbs               |  4 ----
 core/integer.rbs             |  4 ----
 core/numeric.rbs             | 10 +++++-----
 core/rational.rbs            |  4 ----
 test/stdlib/Float_test.rb    |  7 -------
 test/stdlib/Integer_test.rb  |  4 ----
 test/stdlib/Rational_test.rb |  7 -------
 8 files changed, 7 insertions(+), 37 deletions(-)

diff --git a/core/complex.rbs b/core/complex.rbs
index 5126ab086..16d757ce0 100644
--- a/core/complex.rbs
+++ b/core/complex.rbs
@@ -377,7 +377,7 @@ class Complex < Numeric
   #
   #     Complex.rect(1, 2).conj # => (1-2i)
   #
-  def conj: () -> Complex
+  def conj: () -> self
 
   # <!--
   #   rdoc-file=complex.c
@@ -387,7 +387,7 @@ class Complex < Numeric
   #
   #     Complex.rect(1, 2).conj # => (1-2i)
   #
-  def conjugate: () -> Complex
+  def conjugate: () -> self
 
   # <!--
   #   rdoc-file=complex.c
diff --git a/core/float.rbs b/core/float.rbs
index 0674b4a08..4ac8ece35 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -417,10 +417,6 @@ class Float < Numeric
   #
   def coerce: (Numeric) -> [ Float, Float ]
 
-  def conj: () -> Float
-
-  def conjugate: () -> Float
-
   # <!--
   #   rdoc-file=rational.c
   #   - flo.denominator  ->  integer
diff --git a/core/integer.rbs b/core/integer.rbs
index fed03a95d..5ba13db3e 100644
--- a/core/integer.rbs
+++ b/core/integer.rbs
@@ -704,10 +704,6 @@ class Integer < Numeric
   #
   def coerce: (Numeric) -> [ Numeric, Numeric ]
 
-  def conj: () -> Integer
-
-  def conjugate: () -> Integer
-
   # <!--
   #   rdoc-file=numeric.rb
   #   - denominator -> 1
diff --git a/core/numeric.rbs b/core/numeric.rbs
index c62057af0..114e02477 100644
--- a/core/numeric.rbs
+++ b/core/numeric.rbs
@@ -310,18 +310,18 @@ class Numeric
 
   # <!--
   #   rdoc-file=numeric.rb
-  #   - conj()
+  #   - conj -> self
   # -->
+  # Returns `self`.
   #
-  def conj: () -> Numeric
+  def conjugate: () -> self
 
   # <!--
   #   rdoc-file=numeric.rb
-  #   - conj -> self
+  #   - conj()
   # -->
-  # Returns `self`.
   #
-  def conjugate: () -> Numeric
+  alias conj conjugate
 
   # <!--
   #   rdoc-file=rational.c
diff --git a/core/rational.rbs b/core/rational.rbs
index d4ac6b757..bb800bd6a 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -220,10 +220,6 @@ class Rational < Numeric
 
   def coerce: (Numeric) -> [ Numeric, Numeric ]
 
-  def conj: () -> Rational
-
-  def conjugate: () -> Rational
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.denominator  ->  integer
diff --git a/test/stdlib/Float_test.rb b/test/stdlib/Float_test.rb
index b5ef4b79e..4981ac9e2 100644
--- a/test/stdlib/Float_test.rb
+++ b/test/stdlib/Float_test.rb
@@ -79,13 +79,6 @@ def test_coerce
     2.5.coerce(1.1)
   end
 
-  def test_conj
-    a = 31.4
-
-    a.conj
-    a.conjugate
-  end
-
   def test_denominator
     a = 13.3
 
diff --git a/test/stdlib/Integer_test.rb b/test/stdlib/Integer_test.rb
index 1b22893e5..6699b3223 100644
--- a/test/stdlib/Integer_test.rb
+++ b/test/stdlib/Integer_test.rb
@@ -182,10 +182,6 @@ def test_conj
     3.conj
   end
 
-  def test_conjugate
-    3.conjugate
-  end
-
   def test_denominator
     3.denominator
   end
diff --git a/test/stdlib/Rational_test.rb b/test/stdlib/Rational_test.rb
index 94573e14a..6dba75f70 100644
--- a/test/stdlib/Rational_test.rb
+++ b/test/stdlib/Rational_test.rb
@@ -72,13 +72,6 @@ def test_ceil
     # a.ceil(ToInt.new) # does not accept to_int
   end
 
-  def test_conj
-    a = 312r
-
-    a.conj
-    a.conjugate
-  end
-
   def test_denominator
     a = 133r
 

From 3016feb78c48d0defc4c99974037d2980c8d810a Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Tue, 22 Jul 2025 10:07:31 +0900
Subject: [PATCH 02/11] Remove undocumented `#finite?` and `#infinite?`

---
 core/integer.rbs            | 4 ----
 core/rational.rbs           | 4 ----
 test/stdlib/Integer_test.rb | 4 ----
 3 files changed, 12 deletions(-)

diff --git a/core/integer.rbs b/core/integer.rbs
index 5ba13db3e..da88c0fec 100644
--- a/core/integer.rbs
+++ b/core/integer.rbs
@@ -819,8 +819,6 @@ class Integer < Numeric
   #
   def fdiv: (Numeric) -> Float
 
-  def finite?: () -> bool
-
   # <!--
   #   rdoc-file=numeric.c
   #   - floor(ndigits = 0) -> integer
@@ -891,8 +889,6 @@ class Integer < Numeric
   #
   def gcdlcm: (Integer) -> [ Integer, Integer ]
 
-  def infinite?: () -> Integer?
-
   # <!-- rdoc-file=numeric.c -->
   # Returns a string containing the place-value representation of `self` in radix
   # `base` (in 2..36).
diff --git a/core/rational.rbs b/core/rational.rbs
index bb800bd6a..0c598f6ff 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -250,8 +250,6 @@ class Rational < Numeric
   #
   def fdiv: (Numeric) -> Float
 
-  def finite?: () -> bool
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.floor([ndigits])  ->  integer or rational
@@ -285,8 +283,6 @@ class Rational < Numeric
   #
   def hash: () -> Integer
 
-  def infinite?: () -> Integer?
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.inspect  ->  string
diff --git a/test/stdlib/Integer_test.rb b/test/stdlib/Integer_test.rb
index 6699b3223..79d4d1c7f 100644
--- a/test/stdlib/Integer_test.rb
+++ b/test/stdlib/Integer_test.rb
@@ -237,10 +237,6 @@ def test_gcdlcm
     30.gcdlcm(31)
   end
 
-  def test_infinite?
-    30.infinite?
-  end
-
   def test_lcm
     30.lcm(50)
   end

From f4ae21680144cacabf49395f64c8cdc1fba0965d Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Tue, 22 Jul 2025 10:09:22 +0900
Subject: [PATCH 03/11] Remove undocumented `#integer?`

---
 core/complex.rbs  | 2 --
 core/float.rbs    | 2 --
 core/rational.rbs | 2 --
 3 files changed, 6 deletions(-)

diff --git a/core/complex.rbs b/core/complex.rbs
index 16d757ce0..829873900 100644
--- a/core/complex.rbs
+++ b/core/complex.rbs
@@ -522,8 +522,6 @@ class Complex < Numeric
   #
   def inspect: () -> String
 
-  def integer?: () -> bool
-
   # <!-- rdoc-file=complex.c -->
   # Returns the absolute value (magnitude) for `self`; see [polar
   # coordinates](rdoc-ref:Complex@Polar+Coordinates):
diff --git a/core/float.rbs b/core/float.rbs
index 4ac8ece35..b0a36b475 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -622,8 +622,6 @@ class Float < Numeric
   #
   alias inspect to_s
 
-  def integer?: () -> bool
-
   # <!--
   #   rdoc-file=numeric.rb
   #   - magnitude()
diff --git a/core/rational.rbs b/core/rational.rbs
index 0c598f6ff..a9f87060d 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -295,8 +295,6 @@ class Rational < Numeric
   #
   def inspect: () -> String
 
-  def integer?: () -> bool
-
   # <!-- rdoc-file=rational.c -->
   # Returns the absolute value of `rat`.
   #

From b2afdf85e8fba9c11f8860a451b093387d8a6335 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 10:03:27 +0900
Subject: [PATCH 04/11] Remove undocumented methods `#real` and `#real?`

---
 core/float.rbs              |  4 ----
 core/integer.rbs            |  4 ----
 core/numeric.rbs            |  4 ++--
 core/rational.rbs           |  4 ----
 test/stdlib/Complex_test.rb | 14 ++++++++++++++
 test/stdlib/Numeric_test.rb | 19 +++++++++++++++++++
 6 files changed, 35 insertions(+), 14 deletions(-)
 create mode 100644 test/stdlib/Numeric_test.rb

diff --git a/core/float.rbs b/core/float.rbs
index b0a36b475..fe346fa50 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -817,10 +817,6 @@ class Float < Numeric
   #
   def rationalize: (?Numeric eps) -> Rational
 
-  def real: () -> Float
-
-  def real?: () -> true
-
   def rect: () -> [ Float, Numeric ]
 
   alias rectangular rect
diff --git a/core/integer.rbs b/core/integer.rbs
index da88c0fec..b0eb1abd9 100644
--- a/core/integer.rbs
+++ b/core/integer.rbs
@@ -1069,10 +1069,6 @@ class Integer < Numeric
   #
   def rationalize: (?Numeric eps) -> Rational
 
-  def real: () -> self
-
-  def real?: () -> true
-
   def rect: () -> [ Integer, Numeric ]
 
   alias rectangular rect
diff --git a/core/numeric.rbs b/core/numeric.rbs
index 114e02477..de4ea286c 100644
--- a/core/numeric.rbs
+++ b/core/numeric.rbs
@@ -590,7 +590,7 @@ class Numeric
   # -->
   # Returns `self`.
   #
-  def real: () -> Numeric
+  def real: () -> self
 
   # <!--
   #   rdoc-file=numeric.rb
@@ -598,7 +598,7 @@ class Numeric
   # -->
   # Returns `true` if `self` is a real number (i.e. not Complex).
   #
-  def real?: () -> bool
+  def real?: () -> true
 
   # <!-- rdoc-file=complex.c -->
   # Returns array `[self, 0]`.
diff --git a/core/rational.rbs b/core/rational.rbs
index a9f87060d..343832656 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -367,10 +367,6 @@ class Rational < Numeric
   #
   def rationalize: (?Numeric eps) -> Rational
 
-  def real: () -> Rational
-
-  def real?: () -> true
-
   def rect: () -> [ Rational, Numeric ]
 
   alias rectangular rect
diff --git a/test/stdlib/Complex_test.rb b/test/stdlib/Complex_test.rb
index c8b00f206..8652ec1b4 100644
--- a/test/stdlib/Complex_test.rb
+++ b/test/stdlib/Complex_test.rb
@@ -130,3 +130,17 @@ def test_rationalize
     a.rationalize(3.11)
   end
 end
+
+class ComplexInstanceTest < Test::Unit::TestCase
+  include TestHelper
+
+  testing 'Complex'
+
+  def test_real
+    assert_send_type '() -> Integer', Complex(1, 2), :real
+  end
+
+  def test_real?
+    assert_send_type '() -> false', Complex(1, 2), :real?
+  end
+end
diff --git a/test/stdlib/Numeric_test.rb b/test/stdlib/Numeric_test.rb
new file mode 100644
index 000000000..e9d3e9bfd
--- /dev/null
+++ b/test/stdlib/Numeric_test.rb
@@ -0,0 +1,19 @@
+require_relative "test_helper"
+
+class NumericInstanceTest < Test::Unit::TestCase
+  include TestHelper
+
+  testing 'Numeric'
+
+  def test_real
+    assert_send_type '() -> Integer', 1, :real
+    assert_send_type '() -> Float', 1.0, :real
+    assert_send_type '() -> Rational', 1r, :real
+  end
+
+  def test_real?
+    assert_send_type '() -> true', 1, :real?
+    assert_send_type '() -> true', 1.0, :real?
+    assert_send_type '() -> true', 1r, :real?
+  end
+end

From ab3c04792568faad4e546c2d6c9c1192a45a468e Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 10:08:28 +0900
Subject: [PATCH 05/11] Remove undocumented method `#zero?`

---
 core/complex.rbs            | 2 --
 core/rational.rbs           | 2 --
 test/stdlib/Numeric_test.rb | 5 +++++
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/core/complex.rbs b/core/complex.rbs
index 829873900..b4de0a1d3 100644
--- a/core/complex.rbs
+++ b/core/complex.rbs
@@ -777,8 +777,6 @@ class Complex < Numeric
   def to_s: () -> String
 
   def truncate: (?Integer) -> bot
-
-  def zero?: () -> bool
 end
 
 # <!-- rdoc-file=complex.c -->
diff --git a/core/rational.rbs b/core/rational.rbs
index 343832656..085e5871a 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -498,6 +498,4 @@ class Rational < Numeric
   #
   def truncate: () -> Integer
               | (Integer ndigits) -> (Integer | Rational)
-
-  def zero?: () -> bool
 end
diff --git a/test/stdlib/Numeric_test.rb b/test/stdlib/Numeric_test.rb
index e9d3e9bfd..e9d63cd47 100644
--- a/test/stdlib/Numeric_test.rb
+++ b/test/stdlib/Numeric_test.rb
@@ -16,4 +16,9 @@ def test_real?
     assert_send_type '() -> true', 1.0, :real?
     assert_send_type '() -> true', 1r, :real?
   end
+
+  def test_zero?
+    assert_send_type '() -> bool', 0, :zero?
+    assert_send_type '() -> bool', 1r, :zero?
+  end
 end

From 62a635006305f8af620f84fc072c2a78f868050f Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 10:12:44 +0900
Subject: [PATCH 06/11] Remove undocumented method `#to_int`

---
 core/complex.rbs  | 2 --
 core/rational.rbs | 2 --
 2 files changed, 4 deletions(-)

diff --git a/core/complex.rbs b/core/complex.rbs
index b4de0a1d3..864d4e057 100644
--- a/core/complex.rbs
+++ b/core/complex.rbs
@@ -743,8 +743,6 @@ class Complex < Numeric
   #
   def to_i: () -> Integer
 
-  alias to_int to_i
-
   # <!--
   #   rdoc-file=complex.c
   #   - to_r -> rational
diff --git a/core/rational.rbs b/core/rational.rbs
index 085e5871a..bbb968de0 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -448,8 +448,6 @@ class Rational < Numeric
   #
   def to_i: () -> Integer
 
-  alias to_int to_i
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.to_r  ->  self

From aca531623a8eebee33b736e68c59deccf6225741 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 10:17:50 +0900
Subject: [PATCH 07/11] Remove undocumented method `#rectangular`

---
 core/float.rbs    | 2 --
 core/integer.rbs  | 2 --
 core/rational.rbs | 2 --
 3 files changed, 6 deletions(-)

diff --git a/core/float.rbs b/core/float.rbs
index fe346fa50..7c5ec0099 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -819,8 +819,6 @@ class Float < Numeric
 
   def rect: () -> [ Float, Numeric ]
 
-  alias rectangular rect
-
   def remainder: (Numeric) -> Float
 
   # <!--
diff --git a/core/integer.rbs b/core/integer.rbs
index b0eb1abd9..eb4a7ea7b 100644
--- a/core/integer.rbs
+++ b/core/integer.rbs
@@ -1071,8 +1071,6 @@ class Integer < Numeric
 
   def rect: () -> [ Integer, Numeric ]
 
-  alias rectangular rect
-
   # <!--
   #   rdoc-file=numeric.c
   #   - remainder(other) -> real_number
diff --git a/core/rational.rbs b/core/rational.rbs
index bbb968de0..c5831bcdb 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -369,8 +369,6 @@ class Rational < Numeric
 
   def rect: () -> [ Rational, Numeric ]
 
-  alias rectangular rect
-
   def remainder: (Float) -> Float
                | (Numeric) -> Rational
 

From 6d3ed750c2092d4fa9196631e5a231b32508bd93 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 11:25:08 +0900
Subject: [PATCH 08/11] Remove undocumented methods `#phase` and `#angle`

---
 core/float.rbs              | 2 +-
 core/integer.rbs            | 4 ----
 core/numeric.rbs            | 2 +-
 core/rational.rbs           | 6 ------
 test/stdlib/Numeric_test.rb | 6 ++++++
 5 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/core/float.rbs b/core/float.rbs
index 7c5ec0099..35e4efbe1 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -329,7 +329,7 @@ class Float < Numeric
   # <!-- rdoc-file=complex.c -->
   # Returns 0 if `self` is positive, Math::PI otherwise.
   #
-  def angle: () -> (Integer | Float)
+  def angle: ...
 
   # <!--
   #   rdoc-file=complex.c
diff --git a/core/integer.rbs b/core/integer.rbs
index eb4a7ea7b..4df3ea821 100644
--- a/core/integer.rbs
+++ b/core/integer.rbs
@@ -538,8 +538,6 @@ class Integer < Numeric
   #
   def allbits?: (int mask) -> bool
 
-  def angle: () -> (Integer | Float)
-
   # <!--
   #   rdoc-file=numeric.c
   #   - anybits?(mask) -> true or false
@@ -1019,8 +1017,6 @@ class Integer < Numeric
   #
   def ord: () -> Integer
 
-  alias phase angle
-
   def polar: () -> [ Integer, Integer | Float ]
 
   def positive?: () -> bool
diff --git a/core/numeric.rbs b/core/numeric.rbs
index de4ea286c..1327cd935 100644
--- a/core/numeric.rbs
+++ b/core/numeric.rbs
@@ -249,7 +249,7 @@ class Numeric
   # <!-- rdoc-file=complex.c -->
   # Returns zero if `self` is positive, Math::PI otherwise.
   #
-  def angle: () -> Numeric
+  def angle: () -> (0 | Float)
 
   # <!--
   #   rdoc-file=complex.c
diff --git a/core/rational.rbs b/core/rational.rbs
index c5831bcdb..64be7f346 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -188,10 +188,6 @@ class Rational < Numeric
 
   def abs2: () -> Rational
 
-  def angle: () -> (Integer | Float)
-
-  alias arg angle
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.ceil([ndigits])  ->  integer or rational
@@ -327,8 +323,6 @@ class Rational < Numeric
   #
   def numerator: () -> Integer
 
-  alias phase angle
-
   def polar: () -> [ Rational, Integer | Float ]
 
   # <!--
diff --git a/test/stdlib/Numeric_test.rb b/test/stdlib/Numeric_test.rb
index e9d63cd47..fb437a6c0 100644
--- a/test/stdlib/Numeric_test.rb
+++ b/test/stdlib/Numeric_test.rb
@@ -21,4 +21,10 @@ def test_zero?
     assert_send_type '() -> bool', 0, :zero?
     assert_send_type '() -> bool', 1r, :zero?
   end
+
+  def test_angle
+    assert_send_type '() -> 0', 1, :angle
+    assert_send_type '() -> Float', -1, :angle
+    assert_send_type '() -> Float', Float::NAN, :angle
+  end
 end

From 7cddc9ff87155a5cc8707d43f0c1699e2e85d70d Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 11:30:32 +0900
Subject: [PATCH 09/11] Remove undocumented method `#abs2`

---
 core/float.rbs              | 2 --
 core/integer.rbs            | 2 --
 core/numeric.rbs            | 2 +-
 core/rational.rbs           | 2 --
 test/stdlib/Complex_test.rb | 5 +++++
 test/stdlib/Numeric_test.rb | 6 ++++++
 6 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/core/float.rbs b/core/float.rbs
index 35e4efbe1..5b38175cd 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -324,8 +324,6 @@ class Float < Numeric
   #
   def abs: () -> Float
 
-  def abs2: () -> Float
-
   # <!-- rdoc-file=complex.c -->
   # Returns 0 if `self` is positive, Math::PI otherwise.
   #
diff --git a/core/integer.rbs b/core/integer.rbs
index 4df3ea821..ba77fc430 100644
--- a/core/integer.rbs
+++ b/core/integer.rbs
@@ -513,8 +513,6 @@ class Integer < Numeric
   #
   def abs: () -> Integer
 
-  def abs2: () -> Integer
-
   # <!--
   #   rdoc-file=numeric.c
   #   - allbits?(mask) -> true or false
diff --git a/core/numeric.rbs b/core/numeric.rbs
index 1327cd935..46231c55c 100644
--- a/core/numeric.rbs
+++ b/core/numeric.rbs
@@ -244,7 +244,7 @@ class Numeric
   # -->
   # Returns the square of `self`.
   #
-  def abs2: () -> Numeric
+  def abs2: () -> self
 
   # <!-- rdoc-file=complex.c -->
   # Returns zero if `self` is positive, Math::PI otherwise.
diff --git a/core/rational.rbs b/core/rational.rbs
index 64be7f346..46bcb75d9 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -186,8 +186,6 @@ class Rational < Numeric
   #
   def abs: () -> Rational
 
-  def abs2: () -> Rational
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.ceil([ndigits])  ->  integer or rational
diff --git a/test/stdlib/Complex_test.rb b/test/stdlib/Complex_test.rb
index 8652ec1b4..03e0db7da 100644
--- a/test/stdlib/Complex_test.rb
+++ b/test/stdlib/Complex_test.rb
@@ -143,4 +143,9 @@ def test_real
   def test_real?
     assert_send_type '() -> false', Complex(1, 2), :real?
   end
+
+  def test_abs2
+    assert_send_type '() -> Integer', Complex(1, 2), :abs2
+    assert_send_type '() -> Float', Complex.polar(2, 2), :abs2
+  end
 end
diff --git a/test/stdlib/Numeric_test.rb b/test/stdlib/Numeric_test.rb
index fb437a6c0..17dbb970d 100644
--- a/test/stdlib/Numeric_test.rb
+++ b/test/stdlib/Numeric_test.rb
@@ -27,4 +27,10 @@ def test_angle
     assert_send_type '() -> Float', -1, :angle
     assert_send_type '() -> Float', Float::NAN, :angle
   end
+
+  def test_abs2
+    assert_send_type '() -> Integer', 1, :abs2
+    assert_send_type '() -> Float', 1.0, :abs2
+    assert_send_type '() -> Rational', 1r, :abs2
+  end
 end

From cf77d35de689a5f344fde081e7b5f4f9ea3eea83 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 11:37:50 +0900
Subject: [PATCH 10/11] Remove undocumented method `#div`

---
 core/float.rbs    | 2 --
 core/rational.rbs | 2 --
 2 files changed, 4 deletions(-)

diff --git a/core/float.rbs b/core/float.rbs
index 5b38175cd..e0b60defd 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -425,8 +425,6 @@ class Float < Numeric
   #
   def denominator: () -> Integer
 
-  def div: (Numeric) -> Integer
-
   # <!--
   #   rdoc-file=numeric.c
   #   - divmod(other) -> array
diff --git a/core/rational.rbs b/core/rational.rbs
index 46bcb75d9..ae89a5119 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -227,8 +227,6 @@ class Rational < Numeric
   #
   def denominator: () -> Integer
 
-  def div: (Numeric) -> Integer
-
   def divmod: (Integer | Float | Rational) -> [ Integer, Rational ]
             | (Numeric) -> [ Numeric, Numeric ]
 

From b871e6d7103d85670864698d4a849ca5f0626ed1 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Wed, 23 Jul 2025 11:44:34 +0900
Subject: [PATCH 11/11] Remove undocumented method `#to_c`

---
 core/float.rbs              | 2 --
 core/integer.rbs            | 2 --
 core/rational.rbs           | 2 --
 test/stdlib/Numeric_test.rb | 6 ++++++
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/core/float.rbs b/core/float.rbs
index e0b60defd..f96c403ad 100644
--- a/core/float.rbs
+++ b/core/float.rbs
@@ -877,8 +877,6 @@ class Float < Numeric
           | (?by: Numeric, ?to: Numeric) { (Float) -> void } -> self
           | (?by: Numeric, ?to: Numeric) -> Enumerator[Float, self]
 
-  def to_c: () -> Complex
-
   # <!--
   #   rdoc-file=numeric.rb
   #   - to_f -> self
diff --git a/core/integer.rbs b/core/integer.rbs
index ba77fc430..81588d3b9 100644
--- a/core/integer.rbs
+++ b/core/integer.rbs
@@ -1195,8 +1195,6 @@ class Integer < Numeric
   def times: () { (Integer) -> void } -> self
            | () -> ::Enumerator[Integer, self]
 
-  def to_c: () -> Complex
-
   # <!--
   #   rdoc-file=numeric.c
   #   - to_f -> float
diff --git a/core/rational.rbs b/core/rational.rbs
index ae89a5119..7dd2bf13c 100644
--- a/core/rational.rbs
+++ b/core/rational.rbs
@@ -405,8 +405,6 @@ class Rational < Numeric
           | (?by: Numeric, ?to: Numeric) { (Rational) -> void } -> self
           | (?by: Numeric, ?to: Numeric) -> Enumerator[Rational, self]
 
-  def to_c: () -> Complex
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.to_f  ->  float
diff --git a/test/stdlib/Numeric_test.rb b/test/stdlib/Numeric_test.rb
index 17dbb970d..58db4b3e3 100644
--- a/test/stdlib/Numeric_test.rb
+++ b/test/stdlib/Numeric_test.rb
@@ -33,4 +33,10 @@ def test_abs2
     assert_send_type '() -> Float', 1.0, :abs2
     assert_send_type '() -> Rational', 1r, :abs2
   end
+
+  def test_to_c
+    assert_send_type '() -> Complex', 1, :to_c
+    assert_send_type '() -> Complex', 1.0, :to_c
+    assert_send_type '() -> Complex', 1r, :to_c
+  end
 end