Hash equality disagreement for MutableTangent on 32bit (/x86 CI)

[oxinabox]

Since #626 (probably revealed in that CI but overlooked)
the CI has been failing on 32 bit from one of tested added in that PR

 == and hash: Test Failed at /home/runner/work/ChainRulesCore.jl/ChainRulesCore.jl/test/tangent_types/structural_tangent.jl:473
  Expression: hash(MutableTangent{MDemo}(; x = 1.0f0)) == hash(MutableTangent{MDemo}(; x = 1.0))
   Evaluated: 0x9d88e406 == 0x848801a3

There is no reasons obvious to me why these would disagree.
It is required that values that are == (like 1.0 and 1.0f0) also hash that same