[issue27987] obmalloc's 8-byte alignment causes undefined behavior

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

yes.  sys.getsizeof(3.14) is 24.  And it becomes 32 byte in 16byte aligned pymalloc. (+33%)

FYI, jemalloc has 8, 16, 32 size classes, but no 24 too.
http://jemalloc.net/jemalloc.3.html#size_classes

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