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

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +kristjan.jonsson, pitrou, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20416>
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