stdlib/json.rs is written in a very inefficient style

[marijnh]

It takes a very Haskell approach to parsing, cutting off piece by piece of the parsed string, and thus constantly allocating new strings. The functional style can be preserved by passing around a (@str, uint) pair with the offset as well as the string. But it'd probably be better to make it act on a stream abstraction (as in our io module), so that you can parse directly from files and sockets as well.

[brson]

@erickt Do you think your recent changes fix this issue?

[kud1ing]

I am positive @erickt resolved this, since from_str is now implemented as from_reader(io::string_reader(s))