Saving an empty string converts to nil, triggered NOT NULL violation.

[inopinatus]

When saving an empty string, I don't expect it to be converted to nil. That is not normal behaviour. This breaks database NOT NULL string fields.

Probably caused by 9e528f1. I think that should be a configurable option, not a hard-coded behaviour.

Applications with schemas so badly defined that they actually need to map the empty string to NULL in string fields should have to configure that specially.

[inopinatus]

Excellent fix I think. Thanks!