# Problems with deprecations of islower, lowercase, isupper, uppercase

**URL:** https://discourse.julialang.org/t/problems-with-deprecations-of-islower-lowercase-isupper-uppercase/7797
**Category:** Internals & Design
**Created:** [December 15, 2017, 8:19pm UTC](https://discourse.julialang.org/t/problems-with-deprecations-of-islower-lowercase-isupper-uppercase/7797 "2017-12-15T20:19:32Z")
**Posts on this page:** 1
**Showing post:** 13

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### Author: ![StefanKarpinski](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stefankarpinski/32/24_2.png) [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)
#### Post date: [December 16, 2017, 7:38pm UTC](https://discourse.julialang.org/t/problems-with-deprecations-of-islower-lowercase-isupper-uppercase/7797/13 "2017-12-16T19:38:08Z")

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> [@ScottPJones](#):
>
> GB2132, JIS, EUC are not consistent with Unicode

In what way? Do they define their own uppercase/lowercase mappings that are incompatible with Unicode?

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