[issue20416] Marshal: special case int and float, don't use references

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Did you tested for numerous shared int and floats? [1000] * 1000000 and [1000.0] * 1000000? AFAIK this was important use cases for adding 3 or 4 versions.

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<http://bugs.python.org/issue20416>
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