Unicode 4-Byte Char Filter
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Component ID
2689041
Component name
Unicode 4-Byte Char Filter
Component type
module
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Development status
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not-covered
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Looking at this:
https://www.drupal.org/node/1824506#comment-6881382
MySQL (versions older 5.5.3 or not using utf8mb4) is unable to save unicode characters of 4 bytes. So having any of these characters in your long text fields will cause a MySQL error and break things.
This is to convert all characters of 4 bytes into HTML entities. Recommended to add this filter to the bottom of the stack in your text format.
(Note to self: this might be helpful http://www.amp-what.com/unicode/search/ )
Using LONGBLOB (e.g. in watchdog) as fields type in MySQL seems to handle these characters fine!