[encoding] Use floor() more (#23)

In https://github.com/whatwg/encoding/commit/929a3ffec7695b38c1b5529411de52eca6935d61#commitcomment-15013806 @domenic points out some nesting of floor() might needed to preserve the original integer division semantics. I haven't been able to find a case where it gives a different outcome, however.

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Reply to this email directly or view it on GitHub:
https://github.com/whatwg/encoding/issues/23