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 Request for Clarification on Boxes and Functions Kelly Smith <[log in to unmask]> Wed, 19 Feb 2020 00:39:49 +0100 text/plain (17 lines) Hello! I have a couple of general questions about expl3. - Are all boxes and coffins made so that their content is wrapped in a TeX group?   More specifically, is it safe for code to assume that all box/coffin content is   implicity grouped? - Many functions in expl3 are of the form a := func(b, c) (e.g. \str_concat:NNN,   \seq_set_map:NNn) or a := func(b) (e.g. \int_set:Nn, \tl_set:Nn).   Sometimes, one will want to write code like a := func(a, b) or a := func(a),   that is, directly assign a new value to a variable based on its current value.   Is it ever safe to write such code in expl3? Warmly, Kelly