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Same tuple types have different hash #33766

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schlichtanders opened this issue Nov 5, 2019 · 1 comment
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Same tuple types have different hash #33766

schlichtanders opened this issue Nov 5, 2019 · 1 comment

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@schlichtanders
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== and hash are currently inconsistent for Tuple types:

  1. e.g. while Tuple{Array} == (Tuple{Array{T}} where T)
  2. we have hash(Tuple{Array}) != hash(Tuple{Array{T}} where T)

Hence Tuple Types also don't work as keys for Dictionaries in the sense of 1. (which is how I stumbled upon this).

This question was asked first on discourse https://discourse.julialang.org/t/same-types-have-different-hash/30725 and considered to be a bug by @tpapp

Tested for following julia versions: 1.0.3, 1.1.1, 1.2.0, 1.3-rc4
@KristofferC
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Dup of #26105.

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@KristofferC @schlichtanders