# Downsides to depending \`mutable\` field on \`DataType\`?

**URL:** <https://discourse.julialang.org/t/downsides-to-depending-mutable-field-on-datatype/27796>\
**Category:** General Usage\
**Created:** [August 21, 2019, 10:55am UTC](https://discourse.julialang.org/t/downsides-to-depending-mutable-field-on-datatype/27796 "2019-08-21T10:55:01Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [August 21, 2019, 11:32am UTC](https://discourse.julialang.org/t/downsides-to-depending-mutable-field-on-datatype/27796/4 "2019-08-21T11:32:15Z")

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If you have to operate on types, then accessing `T.mutable` is probably your best option.

But is hard to say more without context, can you make an MWE?

> [@Please read: make it easier to help you](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757):
>
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