FIX: issue #4591 (PARSE 0 0 <value> matches one value). #4592
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Fixes #4591 by extending the relevant conditional check in
ST_DO_ACTIONbranch: prior to the fix it countered only the0 <rule>case by jumping over the sub-rule.† Tests are provided.An interesting realization coming from this PR is that
0can act as an ad-hoc comment construct in Parse rules, sort of:† Which should be a single value (see #3679).