require get for DataAPI.invrefpool support (#34)

* require `get` for DataAPI.invrefpool support

* Update Project.toml

* Update src/DataAPI.jl

Co-authored-by: Milan Bouchet-Valat <[email protected]>

Co-authored-by: Milan Bouchet-Valat <[email protected]>

Author: bkamins

Project.toml

@@ -1,7 +1,7 @@
 name = "DataAPI"
 uuid = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
 authors = ["quinnj <[email protected]>"]
-version = "1.5.0"
+version = "1.5.1"
 
 [compat]
 julia = "1"

src/DataAPI.jl

@@ -80,8 +80,10 @@ for which `refpool(A)` is not `nothing`:
 * for any valid index `ix` into `invrefpool(A)` , `refpool(A)[invrefpool(A)[ix]]` is equal to `ix`
   (according to `isequal`) and of the same type as `ix`.
 
-Additionally it is required that `haskey` is defined for `invrefpool(A)`,
-allowing to check if `ix` is a valid index into it.
+Additionally it is required that for `invrefpool(A)` the following methods are defined:
+
+* `Base.haskey`: allowing to check if `ix` is a valid index into it.
+* `Base.get`: allowing to get a value from it or a passed default value if it is not present.
 
 By default, `invrefpool(A)` returns `nothing`.