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F: convertNumber does not throw a conversion error when completing alphabetic characters in decimal

I use a tag <f:convertNumber>to convert decimal input.

<f:convertNumber minFractionDigits="2" />

But it accepts the final alphabetic characters. For example, if I type 12345.1234AAA, it is converted to 12345.123. I would like it to throw a conversion error, instead of trimming the alphabetic characters. How can I achieve this?

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