Tells a list from a value that merely starts with a bracket

All 9 scenarios hold

These rules cover one cell value: strings, quoting, the three collection forms, and the errors a malformed value raises. The three collection forms are a list, a set, and a map.

This table holds two outcomes, and the rule is which outcome a value gets. A value that does not open a list captures as a plain string. Quoted brackets, a stray closing bracket, and a letter before the bracket are three such values. A value that opens a list and does not complete it fails to parse.