io_curve_svg.import_svg.SVGParseFloat() may parse a float containing scientific notation without an exponent sign. For example, 1e3 is a legal float value according to the <number> syntax:
https://www.w3.org/TR/SVG11/types.html#DataTypeNumber
Example SVG file:
https://upload.wikimedia.org/wikipedia/commons/2/2f/Google_2015_logo.svg