Cannot use `common_prefix` functions to get mutable version

[allada]

First, thanks for this library!

I'm looking at a trie/tree library that can quickly give me entries in the tree that match a prefix. This library appears to do this with common_prefix_values() and common_prefixes().

The problem is that when we are using the map it is mutable and we need to publish a value out of the map using a mutable reference, but there's no api for this.

Sadly looking at the code it looks like all the CommonPrefixesIter code paths will need a duplicate mutable version of it (but maybe some templating might work).

[caineblood]

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[sile]

Adding mutable versions of common_prefix_values() and common_prefixes() sounds like a good idea.
Would you be interested in implementing these methods? (or, I can work on them when I have time.)

all the CommonPrefixesIter code paths will need a duplicate mutable version of it

Yes. The duplication is not ideal, but acceptable I think.