function isClassFieldInitialValue(fullNumberNode) {
			const parent = fullNumberNode.parent;

			return (
				parent.type === "PropertyDefinition" &&
				parent.value === fullNumberNode
			);
		}
Returns whether the number is the initial value of a class field.
@param {ASTNode} fullNumberNode `Literal` or `UnaryExpression` full number node
@returns {boolean} true if the number is the initial value of a class field.