Fix proxy interoperations
Turns out the world is not well-behaved and and I get ambigous operators from the conversion-to-value_type and conversion-to-any-vectorclass-vector operators. The first one we need to be usable as the type we are proxying, obviously. The second one we need so a vectorclass vector can be broadcast-assigned or broadcast-copyconstructed from a proxy. So now I have to resolve all the ambiguities by providing all operators anyway.
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