# Complex{Float64} \<: Complex{Real} is false. Intended or potential inconsistency?

**URL:** <https://discourse.julialang.org/t/complex-float64-complex-real-is-false-intended-or-potential-inconsistency/17956>\
**Category:** General Usage\
**Tags:** question\
**Created:** [November 24, 2018, 8:41pm UTC](https://discourse.julialang.org/t/complex-float64-complex-real-is-false-intended-or-potential-inconsistency/17956 "2018-11-24T20:41:48Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [November 25, 2018, 12:45am UTC](https://discourse.julialang.org/t/complex-float64-complex-real-is-false-intended-or-potential-inconsistency/17956/6 "2018-11-25T00:45:57Z")

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> [@xiaodai](#):
>
> I have wondered why Julia has this limitation. Is it for performance or just to reduce complexity?

It’s absolutely critical for performance, [as I explained in another post.](https://discourse.julialang.org/t/problem-with-complex-rationals/9474/7)

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