Remove applicable
and it all const-folds away...
#31
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This was the simplest attempt at fixing the constructor performance. If we simply limit the function to only work for known bitstype integer types (UInt8-UInt64, Int8-Int64), then we don't need that runtime check, since we know it'll work.
That said, this is of course terribly in-extensible, since we're manually restricting this method to only work for the provided types.