Are CSP directives case insensitive?

Hi,

The UA algorithm states we can take source expressions case insensitive.
What about directive names themselves? For example, 'self' and 'SELF' are
acceptable. [1]

> If the source expression is a case insensitive match for 'self'(including the quotation marks)

[1]: http://www.w3.org/TR/CSP/#parsing-1

Thanks.

Yeuk Hon