^(::AbstractIrrational, ::Integer) should probably behave like ^(::Float64, ::Integer) instead of like ^(::Integer, ::Integer)

[nsajko]

using Test
@testset "`^(::AbstractIrrational, ::Integer)`" begin
    @testset "c: $c" for c ∈ (ℯ, π, MathConstants.γ, MathConstants.φ, MathConstants.catalan)
        let e = -1 
            @test c ≈ (c^e)^e
        end    
    end    
end

Test Summary:                        | Pass  Error  Total  Time
`^(::AbstractIrrational, ::Integer)` |    1      4      5  1.6s
  c: ℯ                               |    1             1  0.0s
  c: π                               |           1      1  1.2s
  c: γ                               |           1      1  0.1s
  c: φ                               |           1      1  0.1s
  c: catalan                         |           1      1  0.1s
ERROR: Some tests did not pass: 1 passed, 0 failed, 4 errored, 0 broken.

Among the Irrational constants, only ℯ works as a base for exponentiation here, I guess because that case gets forwarded to exp.

I guess the fix is to define a method something like the following:

^(c::AbstractIrrational, n::Integer) = AbstractFloat(c) ^ n