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how about performance with ruby? It convert code in ruby and after exec? A program write in heist have the same performance of a program writ i nruby?

(number->string 1.2) fails by complaining that to_s expect 0 args, but 1 was given. This is because Ruby's Float#to_s doesn't support the radix arg, as Fixnum#to_s does. I have a partial fix in byteit101@d8b26cc that allows default base 10 to work for floats, but punts on the full float radix support.

(eq? 36893488147419103232 36893488147419103232)
; => #f

So this doesn't seem to be documented anywhere but the heist language supports ruby string interpolation. You might remove all the builtin functions that do bad stuff (load?) and then think you have a safe sandbox. However, the string interpolation allows the sandbox to be broken.

require 'heist'
scheme = Heist::Runtime.new
scheme.eval('"#{puts :foo}"')

I'm not sure if this ruby string interpolation syntax is done on purpose or not because it seems a bit weird to embed a different language for string interpolation. Possibly this was a lazy way of implementing \ escapes.

Anyway, I think it should be documented that the language supports this feature.