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The tryIntegerCast function had an explicit check rejecting any
non-negative integer string starting with '0' (beyond just 0).
This caused CAST('000012' AS INT64) to fail with a conversion
exception, even though leading zeros are valid in integer
representations.
Removed the leading-zero restriction. The integerCastLoop digit
parser handles leading zeros naturally.
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The tryIntegerCast function had an explicit check rejecting any non-negative integer string starting with '0' (beyond just 0). This caused CAST('000012' AS INT64) to fail with a conversion exception, even though leading zeros are valid in integer representations.
Removed the leading-zero restriction. The integerCastLoop digit parser handles leading zeros naturally.