enabling easier access to Const inner value

Author: schlichtanders

Changelog.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- `Base.get` and `Base.getindex` are now both implemented for `Const` (like they are implemented already for `Identity`), to simplify working with `Const`.
 
 ### Fixed
 - `Option(3)` works now

src/Const.jl

@@ -25,9 +25,12 @@ returns true only if given an instance of  [`DataTypesBasic.Const`](@ref)
 Base.isconst(::Const) = true
 Base.isconst(other) = false
 
+# length 0 corresponds directly to Base.iterate
 Base.length(::Const) = 0
 
-# as the length of Const is 0, we intentionally do not support `Base.get`
+# for convenience we support different access functions so that users do not have to remember the name of the single field "value" 
+Base.get(c::Const) = c.value
+Base.getindex(c::Const) = c.value
 
 # const just does nothing, i.e. leaves everything constant
 Base.iterate(c::Const) = nothing