matmul: don't assume the existence of type-conversions #14618
Merged
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(cherry picked from commit 709c867)
This is a backport of #14293 that doesn't rely on #13803. It loses the ability to do
A*B
, but it works withA_mul_B!(C, A, B)
. CC @tkelman, note this is against your tk/backports-0.4.3 branch.In retrospect, in the tests I realize I should have (for mathematical obviousness) named
RootInt
something likePureImaginary
, as a more familiar example of a type of number where!isa(::T * ::T, ::T)
and for which the conversion toT
cannot be defined.