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is there a Lua implementation for VxWorks? That seems to be the main constraint in their choice of language(s)

Lua can be statically linked to anything written in C, because it's just a bunch of C code. That is one of the biggest reasons why it has seen such wide adoption. To quote their readme,

>Building Lua should be straightforward because Lua is implemented in pure ANSI C and compiles unmodified in all known platforms that have an ANSI C compiler.

[0] http://www.lua.org/manual/5.3/readme.html#install

Yes. Canon's older Powershot series of cameras ran VxWorks, and if you're familiar with CHDK, Lua is one of the supported scripting languages.

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