Restrict types accepted by frule muladd and make tests more comprehensive #728
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Closes #727
There is separately already a
@scalar_rule
formuladd
inbase.jl
so this just needs to handle the array cases.
I just make this the same as
rrule
accepts, and also updated tests to be as comprehensive.Technically this rule should also work for arrays of arrays etc.
But so far noone has complained of that not being available for reverse mode, so i doubt they will for reverse mode,
If they do we can always widen it somewhat