bitSize both required and deprecated

[chessai .]

All,

In Data.Bits.Bits, `bitSize` has been marked deprecated for a while.
but in 4.12, it was also given a default implementation. The issue is
that it is in the minimal pragma as a required method. So, if I define
it, I get a deprecation warning, but if I don't define it, I get a
warning about missing implementations.

Is this the intended behaviour?

Thanks