Numeric array data type

[warp-fire]

Reviewing the data types specification, it does not appear that a simple numeric array (i.e. floating point vector, matrix, etc.) is included.

Numeric arrays (and matrices in particular) are invaluable for example in Matlab, R, Python (via NumPy) and Julia, and this data type would help Power FX realise its potential as a general purpose programming language - opening up possibilities in science and engineering domains.

The recent addition of support for dynamic arrays in Excel (along with associated functions such as sequence, randarray, unique, sortby) has been a real breakthrough, hugely increasing the utility of Excel in technical computing. Given that Excel users will increasingly begin to rely on dynamic arrays it seems natural for this functionality to be replicated in Power FX.