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I apologize if my extra PR is causing confusion. My original intention was to merely forward port Antoine changes so they could compile with the 'master' version of Python. Over time I have made some fixes to it. I have kept it open because I'm not sure which approach is better (JSR or duplication).
I did a quick test on the .pyc code size increase. It is actually tiny for the Python code in Lib/.
PR 5006: 21259894 bytes
PR 4682: 21263081 bytes (+0.015%)
Running Serhiy's microbenchmarks:
for i in a:
 try: pass
 finally: pass
PR 4682: Mean +- std dev: 11.0 us +- 0.1 us
PR 5006: Mean +- std dev: 10.9 us +- 0.6 us
for i in a:
 try: continue
 finally: pass
PR 4682: Mean +- std dev: 9.46 us +- 0.85 us
PR 5006: Mean +- std dev: 14.3 us +- 0.3 us
for i in a:
 while True:
 try: break
 finally: pass
PR 4682: Mean +- std dev: 9.20 us +- 0.09 us
PR 5006: Mean +- std dev: 14.3 us +- 0.6 us