* The default locale of en does not include dollar sign in default currency. Assume if there is no currency symbol set that the dollar sign is a good thing to look for in parsefloat.
* Fix for 4485. Serial not serial_number
Also fix bug where updating with a csv that does not include custom field columns should not overwrite current values.
* Rename serial_number to serial in default imports to avoid needing to map weirdly.
* Add Test for 4359. Not reproducable at current though
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