•storage — Storage

•storage Y gives a record of how the items of Y are held. It reads no items, and a pending call stays pending.

• kind names the storage: "bool", "integer", "float64", "float32", "float16", "complex128", "complex64", "character" or "mixed". An atom gives its own kind. That can also be "rational", for an exact rational or an integer beyond 64 bits, or "function". Compact storage holds items of one kind. "integer" covers integers of every width. Mixed storage keeps each item’s kind. Boxed display marks the same storage on its bottom edge. Storage describes each storage.
• pending is $t while fusion hasn’t yet run the call that computes the items.
• view is $t when Y reads another array’s items, as a reshape does.
• active counts the levels of ∂ whose tags Y carries. Under ∂, kind names the storage of the value being differentiated.

•storage 1.5 2.5             ⍝ ["kind":"float64" "pending":$f "view":$f "active":0ₓ]
(•storage 2 3⍴⍳6ₓ).view       ⍝ $t
y←1.5+¿200000⍴0
(•storage y).pending         ⍝ $t