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After debugging a little I think it must be a type, for a few lines above the following declarations are to be seen:

var pureFmtStr = efmt.pureFmtStr, ind = efmt.purejdot, fixed = ind >= 0 ? pureFmtStr.length - ind - 1 : 0, valStr = (val + '').replace(/[^e-0123456789.]/g, '').substring(val < 0 ? 1 : 0), ...

in other words,

var nind = (indVal < 0 ? varStr.length : indVal) + shift;

should read

var nind = (indVal < 0 ? valStr.length : indVal) + shift;

After debugging a little I think it must be a type, typo, for a few lines above the following declarations are to be seen:

var pureFmtStr = efmt.pureFmtStr,
    ind = efmt.purejdot,
    fixed = ind >= 0 ? pureFmtStr.length - ind - 1 : 0,
    valStr = (val + '').replace(/[^e-0123456789.]/g, '').replace(/[^e\-0123456789.]/g, '').substring(val < 0 ? 1 : 0), ...
...

var nind = (indVal < 0 ? varStr.length : indVal) + shift;

var nind = (indVal < 0 ? valStr.length : indVal) + shift;