fix: parse bare hex strings as uint64

[leno23]

Summary

Fixes #334

ToUint64 / ToUint64E now accept bare hexadecimal strings (without a 0x prefix) when the string contains hex digits including at least one letter a-f/A-F.

Example:

cast.ToUint64("882d5422d5fffff") // 613286979481632767

Approach

• After strconv.ParseUint(s, 0, 0) fails, retry with base 16 when the string looks like hex.
• Pure decimal strings that fail for other reasons (overflow, invalid chars) are unchanged.

Test plan

• go test ./...
• Added TestIssue334_HexStringToUint64

Made with Cursor

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