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expand README #4

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Expand Up @@ -96,6 +96,18 @@ julia> Base.infer_return_type(improved, Tuple{NTuple{5, Any}}) # the return typ
NTuple{5, Int64}
```

NB: `typed_callable(Int, Int)` actually only consists of types already present in
`Base` Julia, so it's just a nicer interface for functionality that already comes
with Julia:

```julia-repl
julia> typed_callable(Int, Int)
Base.Fix2{typeof(typeassert), Type{Int64}}(typeassert, Int64) ∘ Int64
```

The three-argument version of `typed_callable` depends on a type defined in this
package, though.

### Use case 2: dispatch on callables with a certain type signature (kind of)

This is what many newcomers to Julia ask for, especially when coming from a
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