ICU collations will make text ordering in PG 10 very flexible. Great for things like alphanumeric invoice numbers: postgr.es/m/CAH2-Wz=bcgm
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I like being able to use "en" without "IE", "GB", "NZ", "AU" which always struck me as unnecessary. I see that "en-US" is different though.
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You can stack options on top of each other. Can add the emoji stuff (see blog.2ndquadrant.com/icu-support-po) to options from my example. Just works.

