Update internal comments to say _something_ about the "API ID".

Best I can tell, the possible values for this aren't documented anywhere.
Issue #18050: Fixed an incompatibility of the re module with Python 3.3.0
binaries.
Null merge
Add a comment making it explicit that itertools.tee() is already 64bit-safe (issue #19049)
Issue #3015: Fixed tkinter with wantobject=False.  Any Tcl command call
returned empty string.
Issue #3015: Fixed tkinter with wantobject=False.  Any Tcl command call
returned empty string.
Merge heads