Turns out this was the last thing using the getTypeClassDictionaries
list, but was also filtering down to the module. Changed to using the
underlying Map, which provides quick indexing of the module.

Some more numbers:

    benchmarking unpatched
    time                 59.75 s    (51.44 s .. 67.70 s)
                         0.998 R²   (NaN R² .. 1.000 R²)
    mean                 59.01 s    (57.54 s .. 60.14 s)
    std dev              1.737 s    (0.0 s .. 1.954 s)
    variance introduced by outliers: 19% (moderately inflated)

    benchmarking patched
    time                 32.53 s    (25.64 s .. 39.85 s)
                         0.994 R²   (0.977 R² .. 1.000 R²)
    mean                 33.09 s    (31.42 s .. 34.06 s)
    std dev              1.496 s    (0.0 s .. 1.670 s)
    variance introduced by outliers: 19% (moderately inflated)

I have no idea why Criterion gives a NaN...