Provide Way to Avoid Allocating To Collect Formatting Errors about fluent-rs HOT 7 OPEN

For the errors - we could swap to accept a mutable reference to a trait object that implements push_error. You can make it a no-op and default impl for Vec.

For args - this is a bit more tricky. I'm not sure if an iterator is actually saving us here, and I suspect it would incur a perf penalty. What we could do, again, is swap it for a trait that you can implement for Vec, HashMap, and your own type.

I'm open to PRs!

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I might be interested in contributing for this if it's something you guys are interested in.

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Oh, good idea, I didn't think of using trait objects!

I think I'll try that out if I get the chance and open a PR if it looks like it works.

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