Cooper.
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Ichor.Actions for casc_interp.aether -- parses a double-quoted
string's already escape-processed content into an ordered list of
literal string runs and Cooper.Ref.* nodes.
Every reference form arrives as one whole raw token (see the grammar
file's own comment on why); each handle_token/3 clause below parses
that captured text with plain Elixir string/regex logic rather than
further Aether grammar structure. The :default/:+alt/:?"msg"
value grammar implemented here (parse_default_value/1) is
deliberately reduced from casc.aether's own value rule -- nil/
bool/int/float/strings/atoms/lists only, no dates/IP/duration/bytes/
tuples/nested refs -- a scope trim for refs nested inside a larger
string (see casc.aether's own comment on why the bare, whole-value
case doesn't have this limitation).