How to convert char to u8?

1

I'm trying to build my own custom json encoder. Where I'm planning to reuse to bytes.
Basically, I'm trying to do something like this

let a: Vec<u8> = Vec::new();
a.push('{');
....
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You can't always do that, some chars are out of a u8's range.
Note that if you're just dealing with u8's, you can prepend a b to the character:

a.push(b'{'):
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3

JSON is defined as “a sequence of Unicode codepoints” (cf §2), so using Vec<char> or String to collect the encoded value is perhaps more appropriate than Vec<u8>, as they are both designed to handle the full range of Unicode.

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