	isValidIdentifierStart: function(ch) {
		return (
			("a" <= ch && ch <= "z") ||
			("A" <= ch && ch <= "Z") ||
			"_" === ch ||
			ch === "$"
		);
	},
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.