On data export, data too long for columns 'contribution_note', 'current_employer' and with custom fields

Possibly related: CRM-12309

Received this error while creating an export that included a contribution note field.

[nativecode=1406 ** Data too long for column 'contribution_note' at row 1]

The contribution note text was 145 characters long in this case.

Checked the table definition and it was limited to 64 characters.
SHOW CREATE TABLE civicrm_export_temp_xxx;
CREATE TABLE `civicrm_export_temp_77eef60135ffb5c5a2df752c9f6d0621` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
...
`contribution_note` varchar(64) COLLATE utf8_unicode_ci DEFAULT NULL,
...

However, in civicrm_note it is not limited:
CREATE TABLE `civicrm_note` (
...
`note` text COMMENT 'Note and/or Comment.',
...