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Two main features were added.
One, various sequence closers can imply a subgroup. This is mainly useful
in contexts like arrays, where you want one subgroup per array element.
Two, predicated opening/closing delimiters. These allow having both an
infinite set of opening delimiters, as well as having a set of closers
that is both infinite and dependant on what the opener was.
Note, however, that predicated openers and closers will be slower than
using normal openers/closers, since every one has to be tried to check if
a token is a opener/closer.
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