The default `bitraverse` implementation should be removed.
The default `bitraverse` is
`bitraverse f g = bisequenceA . bimap f g`.
But `bisequenceA` is an alias of `bisequence`, which in turn is `bitraverse id id`. Neither `bisequence` nor `bisequenceA` is a Bitraversable method, so they can't have alternative definitions.
Sorry if this has already been mentioned.
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