[Templates] 'callers' in Template::Context leaking

[Dan Sully]

* Dan Sully shaped the electrons to say...

>I've been doing a bit of memory debugging for my app (SlimServer) using TT.
>
>There are a few pages which auto-refresh, and they appear to be stacking up
>inside Template::Context - they're never popped off.

Nevermind, this appears to be fixed in 2.15

-D
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