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When converting floating-point to any integer type, the fractional part
is discarded, so any value in the range (-1.0,-0.00) (exclusive) will
truncate to -0.0, and so will fit in an unsigned destination type.

See https://en.cppreference.com/w/cpp/language/implicit_conversion#Floating.E2.80.93integral_conversions.

Change-Id: Id8a5263d486cc3cd25670da27c417c66e28fccdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488717Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819633}