Added enough muladd methods to propagate Zeros.Zero()
#10
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Fixes #9
This PR adds enough
muladdmethods definition so thatmuladd(::Zero,x::Number,::Zero)always returnsZeros.Zero().I tried adding more simplifications, such as
muladd(x::Number,y::Number,::Zero) = x*y, but they are probably unnecessary and that quickly led to a dozens of ambiguities rabbit hole...