copies-rust: send PyBytes values back be dropped ino the parent thread...
copies-rust: send PyBytes values back be dropped ino the parent thread
… instead of acquiring the GIL in the Rust thread in the Drop impl
This commit is based on the premise that crossbeam-channel
with unbounded send and non-blocking receive is faster than
a contended GIL, but that remains to be measured.
Differential Revision:
https://phab.mercurial-scm.org/D9686
