Is `.size()` on a value not supported? Only `size(value)`?

[polarathene]

'hello'.size() seems to fail with:

Err(InvalidArgumentCount { expected: 1, actual: 0 })

Is this a limitation or bug of cel-rust implementation? The CEL spec for string methods notes <string>.size() in addition to size(<string>).

[clarkmcc]

Thanks for reporting! I've pushed a fix in #88