the initial convert implementation only checked the first row for type conversions, therefore it was possible it would detect a column as Long numeric value but later in the frame a Double would be found causing the conversion to fail. though it is rather expensive, convert shouldn't be used all that often (the most common use will be just after reading from disk) so I think it is safe to scan the entire column to test the conversion.
the initial convert implementation only checked the first row for type conversions, therefore it was possible it would detect a column as
Longnumeric value but later in the frame aDoublewould be found causing the conversion to fail. though it is rather expensive, convert shouldn't be used all that often (the most common use will be just after reading from disk) so I think it is safe to scan the entire column to test the conversion.