Streamline the data-ingestion pipeline and outbound parameter encoding loop by
eliminating high-overhead memory copies, optimizing primitive type comparisons,
and increasing TCP window throughput.

Detailed changes:
- session: Request an opportunistic 1 MiB socket receive buffer (SO_RCVBUF) to
  minimize fragmented kernel reads across heavy wire payload streams.
- session: Rewrite `__readFully` to pre-allocate a single message-sized
  bytearray. Populate it directly using zero-copy `sock.recv_into()` on a
  slicing memoryview, replacing an iterative chunk concatenation loop.
- encodedsession: Update `recv()` and input stream targets to return and use
  raw mutable bytearray buffers directly, cutting down an extra copy.
- encodedsession: Refactor `putValue` to use rapid pointer-level exact type
  comparisons (`type(v) is X`) for common database primitives (int, str, float,
  bool) before falling back to heavier hierarchy-aware `isinstance()` checks
  for the long tail.