Trying handle HSlice

[jlhouchin]

I am attempting to write a proc for `[]` which handles `HSlice`.

I am failing to see how to convey to the newSeq the desired T
    
    
    type MyArray*[T: int|float] = ref object
      #Fixed size array type object with state.
      values*: seq[T]
      size*: int
      #...
    
    proc `[]`*[T: int|float](ma: MyArray, hs: HSlice): seq[T] =
      result = newSeq[T](hs.b - hs.a + 1)
      # ...
    
    # I want to be able to do ...
    var ma = newMyArray(...)
    
    let sliceOfMA = ma[5..10]
    
    
    Run

Any help, wisdom or understanding greatly appreciated.