Alessandro Pasotti 68baf74906 Add type check to file writer an memory layer
Fixes #36715

Adds a method to check for QVariant conversions, also
check for integral type narrowing so that for example
floating point 123.45 does not get down casted to integer
without raising an error.
2020-06-20 04:30:18 +10:00
..
2020-06-19 08:47:23 +10:00
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