BigFloat bug with isequal ?

[Jorispilot]

Hi !
Seems BigFloat fails to compare when used in structs. Here is a minimal example

struct DW1
    h::Float64
    l::Float64
end

struct DW2
    h::BigFloat
    l::BigFloat
end

x1, y1 = DW1(1, 2), DW1(1, 2)
x2, y2 = DW2(1, 2), DW2(1, 2)

println("Struct/Float64: ", x1 == y1)
println("Struct/BigFloat: ", x2 == y2)

println("Tuple workaround: ", (x2.h, x2.l) == (y2.h, y2.l))
println("Attribute workaround: ", x2.h == y2.h && x2.l == y2.l)

My output:

Struct/Float64: true
Struct/BigFloat: false
Tuple workaround: true
Attribute workaround: true

To me, the second line should be true.

My versioninfo():

Julia Version 1.6.0
Commit f9720dc2eb* (2021-03-24 12:55 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i5-7440HQ CPU @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.1.0 (ORCJIT, skylake)

[KristofferC]

The difference is

julia> x1.h === y1.h
true

julia> x2.h === y2.h
false

[simeonschaub]

Duplicate of #4648