@rule('<STR_LIT>')<EOL><INDENT>def visit_value(self, _, children):<DEDENT>
return children[<NUM_LIT:0>]<EOL>
Return a value, which is a string, a number, a null/false/true like value.

        Arguments
        ---------
        _ (node) : parsimonious.nodes.Node.
        children : list
            - 0: the value to return

        Result
        ------
        str or int or float or None or False or True

        Example
        -------

        >>> BaseParser('"foo"', default_rule='VALUE').data
        'foo'
        >>> BaseParser('1', default_rule='VALUE').data
        1
        >>> BaseParser('0.1', default_rule='VALUE').data
        0.1
        >>> BaseParser('null', default_rule='VALUE').data is None
        True
        >>> BaseParser('false', default_rule='VALUE').data
        False
        >>> BaseParser('true', default_rule='VALUE').data
        True