NuGet warning NU1604 when restoring an F# project for net4.6.1

[ericstj]

Repro steps

Provide the steps required to reproduce the problem:

1. Create a new F# project targeting any of [net40, net47]
2. Restore that project.

See attached.
fs.zip

Expected behavior

Restores cleanly

Actual behavior

Emits a warning:

C:\scratch\fs\fs.fsproj : warning NU1604: Project dependency System.ValueTuple does not contain an inclusive lower bound. Include a lower bound in the dependency version to ensure consistent restore results.

Known workarounds

Specify either

<DisableImplicitSystemValueTupleReference>true</DisableImplicitSystemValueTupleReference>

or

<DefaultValueTuplePackageVersionValue>4.4.0</DefaultValueTuplePackageVersionValue>

The former omits the reference, the latter specifies the version. Alternatively, one could NoWarn NU1604.

Related information

Regression seems to be caused by b0a5470#diff-41dc74557da02c35657b2d25e250af7b9bedfa5de211c57ebfcd3b91a2f63a7dL76-R80

Which no longer uses DefaultValueTuplePackageVersion defined in the props.