how do I check that something is a DataArrray?

[vitaly]

api.isArray returns true for both DataArray and Array.
I tried playing with api.isArray(arg) && ! Array.isArg(), but it didn't work, as DataView overwrites Array.isArray to return true for DataArrays, duh!

my current solution is api.isArray(arg) && 'function' == typeof arg.array, but it's ugly. can we get pure isDataArray on the api please?

[AB1908]

Hmm, wonder how feasible it is to just throw this in the code for that API and shove it in a PR haha.

[blacksmithgu]

Added for 0.5.0.