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Corner cases

Numbers, currencies and locales

Decimal and group separators by locale, currency formats and their minor units, phone number formats, radix parsing and exact comparison of two proportions.

9 shown here, each at the exact version the library release of October 9, 2026 serves.

What to watch for

  • 1.234 is one thousand two hundred thirty-four in German and about one and a quarter in English.
  • The yen has no minor unit and the Bahraini dinar has three.
  • Two percentages cannot be compared without their denominators.

Test packs and checks

  1. Number formatting by locale

    localeFormats.json

    Number formatting by locale: thousands and decimal separators, symbol side, spacing and decimal digits: 8 rows with a JSON Schema, a checked loader and tests.

    Rows
    8
    Data file
    data/localeFormats.json

    Code moduleMIT8 files, 12.8 KBreads files, runs commands

  2. Locales with their decimal and group separators

    locales.json

    Locales with name, country, language and number decimal/group separators: 358 rows with a JSON Schema, a checked loader and tests.

    Rows
    358
    Data file
    data/locales.json

    Code moduleMIT8 files, 70.5 KBreads files, runs commands

  3. Currency display format by locale

    currency-format.v2.json

    Currency display format by locale: symbol, decimal and group separators, precision and pattern: 358 rows with a JSON Schema, a checked loader and tests.

    Rows
    358
    Data file
    data/currency-format.v2.json

    Code moduleMIT8 files, 68.9 KBreads files, runs commands

  4. ISO 4217 currencies with decimals

    currencies.json

    ISO 4217 currencies with decimals, symbols and default locale: 146 rows with a JSON Schema, a checked loader and tests.

    Rows
    146
    Data file
    data/currencies.json

    Code moduleMIT8 files, 36.2 KBreads files, runs commands

  5. Common world currencies with decimal digits and rounding

    Common-Currency.json

    Common world currencies with symbol, native symbol, decimal digits, rounding and plural name: 119 rows with a JSON Schema, a checked loader and tests.

    Rows
    119
    Data file
    data/Common-Currency.json

    Code moduleCC0-1.0 AND MIT8 files, 38.4 KBreads files, runs commands

  6. Example international phone number formats by country code

    phone-formats.json

    Example international phone number formats by country code: 58 rows with a JSON Schema, a checked loader and tests.

    Rows
    58
    Data file
    data/phone-formats.json

    Code moduleISC AND MIT8 files, 11.7 KBreads files, runs commands

  7. parse_int from pydash

    parse_int

    parse_int from pydash: Converts the given `value` into an integer of the specified `radix`.

    Function
    parse_int
    Project
    pydash

    Code moduleMIT6 files, 8.1 KBruns commands

  8. is_prime from more-itertools

    is_prime

    is_prime from more-itertools: Return ``True`` if *n* is prime and ``False`` otherwise.

    Function
    is_prime
    Project
    more-itertools

    Code moduleMIT6 files, 7.6 KBruns commands

  9. Compare two counted proportions with exact arithmetic and explicit denominators

    baltor_percentage_comparison

    Compare two counted proportions with exact arithmetic and explicit denominators.

    Files
    SKILL.md
    Placed for
    OpenCode

    SkillMIT12 files, 33.3 KBreads files, runs commands

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