TextIOBuffer _WrappedBuffer attr isatty should be bool #12437
Description
There was a small bug in this PR earlier this year to create a protocol for TextIOBuffer _WrappedBuffer
#11420
See here:
Line 171 in a21c4bc
isatty should return bool.
Notice isatty on IOBase is a bool:
Line 63 in a21c4bc
And literally every other occurrence of isatty in every other type stub is a bool too.
Looks like the mistake came from this comment because that comment incorrectly lists isatty as int too.