Prevent excluding "," from comma-separated strings

Author: cdoublev

lib/parse/grammar.js

@@ -488,7 +488,7 @@ function traverse(node, parser) {
                 value = sequence.map(definition =>
                     node.children.find(node => node.definition === definition)?.value ?? omitted)
             } else if (listSeparator) {
-                value = node.children.map(node => node.value).filter(value => value.value !== listSeparator)
+                value = node.children.map(node => node.value).filter(value => !isDelimiter(listSeparator, value))
             } else {
                 value = node.children.map(node => node.value)
             }