(Int, Bool[])[]

OK, this type is hitting two limitations of entry points at once. :)

1. Tuples with unnamed items are not supported; this implies that arrays of tuples are also not supported.
2. Arrays inside arrays are not supported.

I agree that it would be nice to support both of them, especially since we recommend using @EntryPoint even for programs with a C#/F#/Python host. For consistency I think we should support them in the default command-line interface as well.

We managed to avoid doing any particularly complicated parsing on the command-line by not supporting these types. For 1D arrays, those naturally map to a space-separated list of command-line arguments. For arrays of tuples and nested arrays, I don't see a way around a proper recursive parser that supports Q#-like syntax for unnamed tuples and nested arrays. So this would be:

--memory-data '(0, [true, false])' '(1, [true, true, true])' ...

where the quotes ' are there so that the shell treats it as one argument. Does this seem right or did you have a different syntax in mind?

By the way, for this specific case, is it possible to replace (Int, Bool[])[] with BigInt[], where the Int address is the index in the array and the Bool[] data is a BigInt - or do you need to support non-contiguous memory addresses?