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LibJS: Return early from parseFloat() if argument is a number
This saves us both a bit of time and accuracy, as Serenity's strtod() still is a little bit off sometimes - and stringifying the result and parsing it again just increases that offset.
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@ -153,6 +153,8 @@ Value GlobalObject::is_finite(Interpreter& interpreter)
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Value GlobalObject::parse_float(Interpreter& interpreter)
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{
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if (interpreter.argument(0).is_number())
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return interpreter.argument(0);
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auto string = interpreter.argument(0).to_string(interpreter);
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if (interpreter.exception())
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return {};
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