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When the XML file embeds the table structure, $analyses is null and buildSql() falls back to is_numeric() to decide whether to quote. That strips quotes from values like "01234", which silently drops the leading zero on a varchar column and causes a duplicate-key error if the table also contains "1234". Add a roundtrip check: a value is still treated as numeric only when casting it to int or float gives back the original string. "01234", "1e10" and similar fail the roundtrip and stay quoted; plain integers like 1 and 1234 keep their existing unquoted form. Signed-off-by: Eyüp Can Akman <eyupcanakman@gmail.com>