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Store boxed slices instead of Vec objects in Context (#278)

We never resize the unit ranges, units, or sup units that we parsed --
they stay what they were when we instantiated the Context object. As
such, we don't need to store Vec objects, which include a capacity. Do
what we do for the Functions type and just store boxed slices. Doing so
cuts a machine word of each, but also trims heap allocations to the
minimal size required in the process.

Signed-off-by: Daniel Müller <deso@posteo.net>
Co-authored-by: Daniel Müller <deso@posteo.net>

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