CQL3 And Map Literals

[Gareth Collins]

Hello,

I have been playing with map literals in CQL3 queries. I see that
single-quotes work:

{'foo':'bar'}

but double-quotes do not:

{"foo":"bar"}

I am curious. Was there a specific reason why it was decided to use
single-quotes?
I ask because double-quotes would make this valid json.

thanks in advance,
Gareth