Gregory P. Smith <g...@krypto.org> added the comment:

long double was changed to double seven years ago to avoid a different kind of 
undefined behavior...  
https://github.com/python/cpython/commit/e348c8d154cf6342c79d627ebfe89dfe9de23817#diff-fb41bdaf12f733cf6ab8a82677d03adc

We are going in circles here.

Submitting that PR to 3.7 caused the undefined behavior sanitizer buildbot to 
go back to reporting a ton more damage.

build before: https://buildbot.python.org/all/#/builders/137/builds/878 
   52k lines of test stdio
build after: https://buildbot.python.org/all/#/builders/137/builds/879
 4900k lines of test stdio

----------
resolution: fixed -> 
stage: resolved -> needs patch
status: closed -> open

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue27987>
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