fix: Handle `image`/`text`/`ntext` column data with a byte length of 65535.
fix: Handle `image`/`text`/`ntext` column data with a byte length of 65535.

This fixes an issue where data in `image`, `text` or `ntext` columns was incorrectly recognized as `null` when their byte length was exactly `65535` bytes.
pekim/tedious,tediousjs/tedious,tediousjs/tedious