get(::Dict{DataType,T}, key, default) fails to get the right value

[yeesian]

The following command fails on the macOS binary for Julia 1.6:

  | | |_| | | | (_| |  |  Version 1.6.0 (2021-03-24)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> get(Dict{DataType,Integer}(
           Any         => 0,
           UInt8       => 1), UInt8, error("Unknown DataType"))
ERROR: Unknown DataType
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:33
 [2] top-level scope
   @ REPL[1]:1

It works if it's indexed directly (per https://discourse.julialang.org/t/using-datatype-as-key-in-dict ):

julia> Dict{DataType,Integer}(
                  Any         => 0,
                  UInt8       => 1)[UInt8]
1

If it helps for motivation/context: I was looking into not using the indexing behavior due to yeesian/ArchGDAL.jl#178.

[simeonschaub]

The arguments to any function call are always evaluated first, so this behavior is expected. get does have a method accepting a function as the first argument though for exactly this use case: https://docs.julialang.org/en/v1/base/collections/#Base.get

[yeesian]

The arguments to any function call are always evaluated first, so this behavior is expected.

That makes sense, thanks for the explanation!