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Re: [Cbor] Money amounts

Changaco <changaco@changaco.oy.lc> Mon, 25 February 2019 10:44 UTC

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Date: Mon, 25 Feb 2019 11:44:18 +0100
From: Changaco <changaco@changaco.oy.lc>
To: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [Cbor] Money amounts
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On Mon, 25 Feb 2019 10:41:14 +0100 Carsten Bormann wrote:
> What is the difference between a 77112 basket with just one currency in it and a 77111 money?

We use baskets when summing amounts that *can* be in different currencies, but in fact there may only be one currency, or none at all, so the basket can end up containing only one currency or be completely empty.

I put an example of a basket with only one currency to show that it is valid.

> (I’m not a big fan of having to parse the string version of 77111, but if that string style is important to your application, that’s not relevant.)

It's not really important, I added it mostly because for some "small" amounts it can actually be shorter than other formats.

For example `"EUR10.00"` takes up 9 bytes whereas `["EUR", 10.00]` uses 11 bytes when the number is encoded as a decimal fraction (tag 4).

> You never have the use case of an alternative (like 77112, but “either pay USD 25 or EUR 20 or CAD 30 or AUD 35”)?

No.

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