Checkbox template variable not storing in Revo

Posted in desperation: I have a template variable of the input type "check box". It displays just fine, but the value never saves at all - you uncheck it, save, refresh and it’s still checked. A TV with identical settings of the type "text" works just fine.

Anyone else seen this?

OK, I found out why checkbox values aren’t stored. The answer is here: http://modxcms.com/forums/index.php?topic=64775.0

Essentially, when you uncheck a checkbox and hit "Submit", ExtJS doesn’t send a 0 down the wire; it sends nothing. If your TV checkbox is checked, it stays checked. Evil.

So the lesson seems to be: never use checkboxes for TVs. Radio buttons for yes and no work just fine. See the documentation here: http://rtfm.modx.com/display/revolution20/Template+Variable+Input+Types#TemplateVariableInputTypes-RadioOptions

Could someone with power over the documentation drop this into the entries for TVs and Radio Buttons, please, to save the next poor idiot some suffering.