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TengJianPing
58765f9cde
Related PR: Bug introduced by #60004 Fix incorrect string-to-decimal parsing for scientific notation. Previously, decimal parsing could count exponent characters as part of the significand, causing values like `"1.4E+2"` to be cast incorrectly as `14` instead of `140`. It could also round very small scientific-notation values incorrectly when the significant digit appeared after implicit fractional zeros, such as `"5e-17"` for scale 15. This change makes the parser track the end of the significand separately from the exponent, applies exponent-based decimal-point shifting correctly, and only rounds when the next real significand digit is the first discarded fractional digit. Also add comments to help understand the code.