# A undocumented breaking change in Julia0.7?

**URL:** <https://discourse.julialang.org/t/a-undocumented-breaking-change-in-julia0-7/15065>\
**Category:** General Usage\
**Created:** [September 17, 2018, 1:07pm UTC](https://discourse.julialang.org/t/a-undocumented-breaking-change-in-julia0-7/15065 "2018-09-17T13:07:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jieyi\_Xiong](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jieyi_xiong/32/32032_2.png) [@Jieyi\_Xiong](https://discourse.julialang.org/u/Jieyi_Xiong)\
**Post date:** [September 17, 2018, 1:07pm UTC](https://discourse.julialang.org/t/a-undocumented-breaking-change-in-julia0-7/15065/1 "2018-09-17T13:07:13Z")

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I found bits(‘A’) in Julia0.7 is “01000001000000000000000000000000”, which is different from Julia0.6 “00000000000000000000000001000001”. However, in both versions, bits(UInt32(‘A’))=“00000000000000000000000001000001”. So in Julia 0.7, bits(‘A’)!=bits(UInt32(‘A’)).

This change may associates with a compatible issue of JLD2: [Char data type is not compatible between Julia 0.7 and Julia 0.6 · Issue #110 · JuliaIO/JLD2.jl · GitHub](https://github.com/simonster/JLD2.jl/issues/110)

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**Author:** ![mschauer](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mschauer/32/13946_2.png) [@mschauer](https://discourse.julialang.org/u/mschauer)\
**Post date:** [September 17, 2018, 7:15pm UTC](https://discourse.julialang.org/t/a-undocumented-breaking-change-in-julia0-7/15065/2 "2018-09-17T19:15:34Z")

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The answer is probably somewhere here [Changes to the representation of Char](https://discourse.julialang.org/t/changes-to-the-representation-of-char/7291)