Need tests for ColumnSpecialization and ParameterSpecialization

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Ugh, don't wanna, but it'd probably be best to have this in before starting on #144...

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Whelp, tests for both of these have been added (as well as a fix for a bug it uncovered in ParameterSpecialization's implementation), but doing so revealed something quite interesting:

Turns out, despite having already been documented, ColumnSpecialization's chunked transfer (the only feature of ColumnSpecialization) was never actually implemented.

Sure, I'd seen the "//TODO: support chunk delegate" buried in one function, but I'd just assumed that was referring to supporting it for some particular edge case.

Fun times with inherited codebases, amiright? :)

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Closed via cedb4a1