break lexBool loop on ',' to allow decoding []bool

[maclav3]

lexBool would break on decoding key = [true, false], because the loop would go up to true, and then miss both cases.

[cespare]

@maclav3 thanks very much for bringing this bug to our attention.

There were some other cases besides comma: for instance, in your example, the ] that comes after false would become part of that token. The inline table terminator, }, is another exception.

I ended up fixing this using a different workaround in b26d9c3.