I just created trac #8651, which is copied here since I don't know to
whom to forward the report.

We all know binomial(n,0) should be 1. But we're not getting that
answer in the following case.

sage: var('n, k')
(n, k)
sage: binomial(n, 0)  # this is OK
1
sage: binomial(n, k).subs(k=0)  # this is a problem!
0

Thanks!

- Ryan

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