Could it even be that the double quotes around values are interpreted as some kind of "strong quotes", where single quotes wouldn't? So, inserting '0123' gets c

Could it even be that the double quotes around values are interpreted as some kind of "strong quotes", where single quotes wouldn't? So, inserting '0123' gets coerced to integer 123, whereas "0123" in doubles is interpreted as "No really, I mean it, this is a string!" and therefore keeps the leading zero? Just a WAG.