Unlike the other nesting modes, we need to use some quite different code
for comparing object-backed vs. map-backed blocks, which are both possible
interpretations of the NestingMap mode depending on whether the inner
block type has any dynamically-typed attributes.
Therefore we split that case into two parts depending on what type kind
we find, so that each of the parts can then be shaped more like the other
type-specific variants of assertNestedBlockCompatible. (This also removes
one level of if nesting to placate the nestif linter.)
Signed-off-by: Martin Atkins <mart@degeneration.co.uk>
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