Make FormattedDateTime Copy and Clone #4476
Merged
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Do we want this? We don't have it currently.
Making these Copy/Clone is slightly limiting because then we can't pre-process patterns in the format function.
On the other hand, it is consistent with the ICU4X design principle of intermediate types being ephemeral and throw-away.
Please review and approve @zbraniecki @Manishearth @robertbastian