[psychoslave]

Nice, but if the goal making the code easier to read, why keep the $ prefix cluttering ?

Having mutable and constants is great, but I'm not fan of apocopes like pub, mut and func. English is full of small words, there is really no need to go out of it. Think let, tie, tye, bag, box...

You can also make string and array as expression in which you can call functions through dot notation. Or even like ruby have percent notation à la Perl/Ruby for array/string creation.