:sig
void json_consume_space(String s, u32& i)

:params
s : JSON source string
i : current byte offset; advanced past JSON whitespace

:see
>string
json_encode
json_decode

:content
Advances `i` past JSON whitespace in `s`.

This helper is mainly useful when writing a parser that follows UCE's JSON parsing rules. Most page code should call `json_decode()` instead.

Example:

```uce
u32 i = 0;
json_consume_space("  \n  {\"ok\":true}", i);
// i now points at the opening brace
```
