*.c: Be more careful about `PySequence_Size'.
authorMark Wooding <mdw@distorted.org.uk>
Sun, 24 Nov 2019 16:36:24 +0000 (16:36 +0000)
committerMark Wooding <mdw@distorted.org.uk>
Wed, 27 Nov 2019 15:10:44 +0000 (15:10 +0000)
This can be implemented by Python, so it can throw exceptions.
Fortunately, Python checks that the result is nonnegative, so we don't
have to worry about that.


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