suggestion: built in syntax for array indexing

[bjorndm]

Sorry, but here is another suggestion. Now, expr has arrays, which is very useful. But there is no built in syntax right now to index them. While it is possible to use the Extender to add an index or similar function, built-in support would simplify the syntax for non-programmer end users. I was thinking that perhaps a .<integer> syntax could be used, like in your great gjson libary, although .[integer] now also works though the Extender. Again, I can probably contribute a PR but I'd like to ask if you consider this an acceptable feature?

Thanks again for your consideration!

[tidwall]

Ideally an array could be accessed using the standard accessor syntax, like arr[10].