Digit grouping and minimumGroupingDigits

[Edward Welbourne]

Hi all,

Some time ago I attempted to implement digit grouping according to
CLDR's data; in the course of that I interpreted minimumGroupingDigits
as the smallest size that the most-significant group could be, so that a
minimum grouping of 2 with a pattern grouping of 3 would not only write
one thousand as 1000 but also one million as 1000,000 (if separator is
comma), again omitting the separator for a leading group that would have
only one digit in it.

Prompted by a user bug-report, I'm now re-reading [0]

The minimumGroupingDigits can be used to suppress groupings below a
certain value. This is used for languages such as Polish, where one
would only write the grouping separator for values above 9999. The
minimumGroupingDigits contains the default for the locale.
* The attribute value is used by adding it to the grouping separator
value. If the input number has fewer integer digits, the grouping
separator is suppressed.

[0] just above
https://www.unicode.org/reports/tr35/tr35-63/tr35-numbers.html#Examples_of_minimumGroupingDigits

as meaning that grouping is suppressed for 1000 through 9999 but, after
that, digits are grouped in blocks of three even if this leaves the most
significant digit in a group of size one, so 1,234,567 rather than
1234,567 (as I'd previously supposed).

First I'd like to check: is my revised interpretation correct ? Or am I
misleading myself by misreading it ? If the latter, perhaps we can come
up with better wording. If the former, it would perhaps be better if
* the specification overtly said that, once there is one group, the most
significant group can be smaller than the minimumGroupingDigits size,
* the table linked above could also include entries for one million in
the pattern-grouping = 3 parts.

Eddy.

[Mark Davis Ⓤ]

It only has an effect at the lowest level, the first grouping separator from the left. So with 2 you'd get

1000

10,000

100,000

1,000,000

...

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[Edward Welbourne]

Mark Davis Ⓤ (4 August 2023 16:06) wrote:
> It only has an effect at the lowest level, the first grouping separator from the left. So with 2 you'd get
> 1000
> 10,000
> 100,000
> 1,000,000
> ...

Thanks for the speedy clarification.
I'll fix my implementation, then ;^>

Eddy.