conj(::Any) should be deprecated

[dlfivefifty]

conj(::Any) should be deprecated, by the same logic as transpose(::Any):

julia> struct Foo end

julia> conj(Foo())
Foo()

julia> transpose(Foo())
ERROR: MethodError: no method matching transpose(::Foo)
Closest candidates are:
  transpose(::Missing) at missing.jl:75
  transpose(::Number) at number.jl:174
  transpose(::LinearAlgebra.Transpose) at /Users/solver/Projects/julia7-branch/usr/share/julia/site/v0.7/LinearAlgebra/src/adjtrans.jl:105

[Sacha0]

Agreed. This method was the root cause of the recent issue with conjugation of I failing. Best!

[JeffBezanson]

Triage accepts. @dlfivefifty are you available to work on this?

[dlfivefifty]

Sure.

[JeffBezanson]

Fixed by #26288.