Add support for 3-2-2 comma rule (Indian number grouping)

[Claude]

Status

PENDING REVIEW

What does this PR accomplish?

• Adds support for Indian numbering system (3-2-2 comma rule) where numbers are formatted as 1,00,00,000 instead of Western 10,000,000
• Implements instance-wide configuration for number grouping style
• Provides environment variable configuration support via MB_CUSTOM_FORMATTING

How to test this manually?

Option 1: UI Configuration

1. Start the application and navigate to Admin → Settings → Localization
2. Under the Numbers section, select Grouping style
3. Choose "1,00,00,000 (Indian)" and verify numbers throughout the application display with 3-2-2 grouping
4. Test with various number types:
   • Large numbers: 10,000,000 → 1,00,00,000
   • Currency: $10,000,000.00 → $1,00,00,000.00
   • Negative: -1,000,000 → -10,00,000
5. Combine with different separator styles (period, space, apostrophe)
6. Verify Western grouping (10,000,000) remains default

Option 2: Environment Variable Configuration

1. Set the MB_CUSTOM_FORMATTING environment variable:

   MB_CUSTOM_FORMATTING='{"type/Number":{"number_separators":".,","number_grouping":"indian"}}'

2. Start the application and verify Indian grouping is applied throughout
3. Test with different separator combinations:

   # Indian grouping with European separators
   MB_CUSTOM_FORMATTING='{"type/Number":{"number_separators":",.","number_grouping":"indian"}}'

Additional notes:

Implementation approach:
Uses native locale support (en-IN for Indian, en for Western) rather than custom grouping logic, ensuring standards compliance and maintainability.

Changes made:

• Frontend types: Added number_grouping field to NumberFormattingSettings
• Number formatter: Modified to use en-IN locale when number_grouping is "indian"
• Settings UI: Added radio controls for grouping style selection (defaults to "western")
• Backend validation: Added available-number-groupings set and validation
• JVM backend: Updated active-locale to return Indian locale for 3-2-2 grouping
• ClojureScript backend: Updated formatter to use Indian locale
• Tests: Added comprehensive test suite covering all grouping scenarios

Environment variable support:
The number_grouping setting is stored within the existing custom-formatting JSON structure, making it automatically configurable via the MB_CUSTOM_FORMATTING environment variable. This allows instance-wide configuration in containerized deployments without requiring UI access.

Backward compatibility:
Default behavior unchanged (Western grouping). New number_grouping field is optional.

Screenshots:

Settings UI showing the new grouping style option would be helpful here

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add support for 3-2-2 comma rule.</issue_title>
<issue_description>Currently Numbers are always displayed in 3-3 comma rule. Add support for adding 3-2-2 comma rule.

Also check if it's possible to configure an instance to use 3-2-2 comma rule</issue_description>

Comments on the Issue (you are @claude[agent] in this section)

• Fixes Add support for 3-2-2 comma rule. #2

[gigincg]

@claude[agent] Are you sure this ability is not available using an ENV

[Claude]

@claude[agent] Are you sure this ability is not available using an ENV

Yes, this feature is available via the MB_CUSTOM_FORMATTING environment variable. Since number_grouping is stored within the custom-formatting setting structure, you can configure it using:

MB_CUSTOM_FORMATTING='{"type/Number":{"number_separators":".,","number_grouping":"indian"}}'

This allows instance-wide configuration via ENV without requiring UI access. The setting validates the number_grouping value on the backend to ensure it's either "western" or "indian".