Proposal: Support for Proper Modular Arithmetic

# Lachlan Hunt (a year ago)

I have researched and drafted a proposal to address the deficiencies with the remainder operator (%) and introduce support for the proper mathematical modulo operation.

lachlanhunt/es-proposals/tree/master/modulo

In summary, the % operator is commonly used and referred to as a mod by developers, but is fundamentally broken because it takes the sign of the dividend. The proposal outlines two alternative algorithms (Euclidian and floored division) that are commonly used within other languages and suggests either new Math.mod or .floorMod methods, or new infix operator such as %% or mod to address the situation.