bMotion doesn't want π, or any other UTF8 characters

[bmotion]

Doesn't like getting handed UTF8 characters

In channel

(16:15) (+znx) do you want some π mon?
(16:15) (@MonicaOff) Yes please znx.
(16:15) (*) znx gives mon some π

On console

[16:16] (d)bMotion:  Got handed !�! by znx in #linux-noob
[16:16] Tcl error [bMotion_event_action]: error writing "file19": invalid argument

[james]

Think this is TCL's UTF-8 support (or lack thereof) failing to write the new item to the abstract cache file; not bMotion