# Type promotion: Why not use more unions?

**URL:** https://discourse.julialang.org/t/type-promotion-why-not-use-more-unions/8748
**Category:** Internals & Design
**Tags:** question
**Created:** [February 1, 2018, 5:44pm UTC](https://discourse.julialang.org/t/type-promotion-why-not-use-more-unions/8748 "2018-02-01T17:44:26Z")
**Posts on this page:** 1
**Showing post:** 2

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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: [February 1, 2018, 8:23pm UTC](https://discourse.julialang.org/t/type-promotion-why-not-use-more-unions/8748/2 "2018-02-01T20:23:57Z")

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See also the discussion here: [https://github.com/JuliaLang/julia/issues/22630#issuecomment-314947604](https://github.com/JuliaLang/julia/issues/22630#issuecomment-314947604)

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_[View the full topic](https://discourse.julialang.org/t/type-promotion-why-not-use-more-unions/8748)._