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Argument expansion may change states (create new hash entries or raise a l3flag). Expanding arguments in a group is then wanted in some cases, See an example in https://redirect.github.com/latex3/latex2e/pull/1592.
\exp_args_in_group:<args> can be defined as
\group_begin: \exp_args:N<args> \group_end:What if x-type expansion is involved?
Source of the idea
https://redirect.github.com/latex3/latex2e/pull/1592/files#r1895056903
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