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What I like about Lua is just the same thing I like about Pascal:
it is immediately readable, especially when syntax highlighted in
a good editor, and you can code in Lua quite rapidly because while
typing long words like 'function' and statements requiring two keywords
like 'if'...'then', your brain is racing ahead.

What puts me off from the current spate of lightweight syntax 
proposals is just the same thing I hate about C and Perl: they
are cryptic and the saving in keystrokes now is not worth the
brain pain later.  

The Pascal model has served Lua well so far: keep the language 
itself simple and sweet, and put all the power into libraries.

The only lightweight syntax I would be prepared to support is one 
that is in Pascal but not in Lua: s[i] == s:sub(i,i) for strings, 
not because it saves six characters, but because it enhances