Function getPrecisionSafe

test/lib/testHelper.js:3227–3238

* Copied from src/util/number.ts * Get precision with slow but safe method

(val)

     * Get precision with slow but safe method
     */
    function getPrecisionSafe(val) {
        // toLowerCase for: '3.4E-12'
        var str = val.toString().toLowerCase();

        // Consider scientific notation: '3.4e-12' '3.4e+12'
        var eIndex = str.indexOf('e');
        var exp = eIndex > 0 ? +str.slice(eIndex + 1) : 0;
        var significandPartLen = eIndex > 0 ? eIndex : str.length;
        var dotIndex = str.indexOf('.');
        var decimalPartLen = dotIndex < 0 ? 0 : significandPartLen - 1 - dotIndex;
        return Math.max(0, decimalPartLen - exp);
    }

    /**
     * Copied from src/util/number.ts