 sequence in <span class="emphasis"><em>fmt</em></span>,
        replace that sequence with either the character(s) it represents, or the
        sequence of characters within <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> to which it refers. The bitmasks specified
        in flags determines what format specifiers or escape sequences are recognized,
        by default this is the format used by ECMA-262, ECMAScript Language Specification,
        Chapter