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Overflow checks
Ensure that we don't overflow words on 32-bit architectures.
This should be handled by commit 60914c4b723972a0572373bdb96da19ec4a064f6 and the tests in later commits, but it's always worth reviewing carefully. We don't currently have CI on a 32bit arch.
If we set AppVeyor up again, we can easily get a 32bit Windows build running -- which we should do anyway.