Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

We can add a note the the docs that weights are assumed to be non-negative, but 
I don't want to add an extra O(n) step to check for unusual inputs with 
undefined meaning -- that would just impair the normal use cases for near zero 
benefit.

----------
assignee:  -> docs@python
components: +Documentation -Library (Lib)
nosy: +docs@python
priority: normal -> low

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37624>
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