bcmul doesn't calculate the correct values

[Jordan Hoff]

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Description

bcmul does not calculate values correctly

PHP 7.0.13

bcmul('2.5', '2.5') // "6"
bcmul('2.5', '2.5', 2) // "6.25"

Javascript

bcmul('2.5', '2.5') // "625"
bcmul('2.5', '2.5', 2) // "625."

[Jordan Hoff]

This issue should be fixed by #317

[Kevin van Zonneveld]

Merged #317! 🎉