floattime() must not raise an error if the current time is 1970.1.1 at 00:00.

  without mainloop.

  Thanks to Roger Serwy for patch.

samples and a reference. Also fix the other nits mentioned in the issue.

This also partially addresses issue #14006.

in sys_update_path().

unittest.mock: a mock created by patch with a spec as the list argument will be callable if __call__ is in the spec

with decimal.py. The standard specifies InsufficientStorage (MallocError) as
a sub-condition of InvalidOperation. This allows a calculation to continue
with NaN results when allocation fails.

to a known bug in pthread implementation on FreeBSD < 7).

to a known bug in pthread implementation on FreeBSD < 7).

correctly list the stack params it expects.