fix(chart) :: drop unreachable branch

[81reap]

The check > 10 and NaN (a 3 char string) cannot both hold at the same time.

Removes the branch and sets maximumFractionDigits: 2.

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[lovasoa]

the checks are not equivalent are they? do you have examples of differences in concrete charts and why you think the new version is better? If we change digit rendering in charts, we must explain the impact to users in CHANGELOG

[81reap]

I'm not quite sure I follow. the branch is impossible to reach in most locales AFAICT so it was falling back to the Locale default length (which is 3 in "en"). If you run this snippet in your browser

const before = (value, locale) => {
  const str_val = value.toLocaleString(locale);
  if (str_val.length > 10 && Number.isNaN(value)) return value.toFixed(2);
  return str_val;
};

const after = (value, locale) =>
  value.toLocaleString(locale, { maximumFractionDigits: 2 });

const LOCALES = ["en", "fr", "de", "ja", "ar-EG", "fa-IR", "my", "am"];

// (1) maximumFractionDigits: 2 — drops a digit in every locale.
const digits = {};
for (const locale of LOCALES) {
  const row = {};
  for (const value of [1.2345, 0.005, 1234.5678, 1234567890.12345]) {
    const b = before(value, locale);
    const a = after(value, locale);
    row[value] = b === a ? `${b}  (same)` : `${b} → ${a}`;
  }
  digits[locale] = row;
}
console.table(digits);

// (2) The removed branch — only fires where NaN formats past 10 characters.
console.table(
  LOCALES.map((locale) => ({
    locale,
    toLocaleString: Number.NaN.toLocaleString(locale),
    "branch fires": Number.NaN.toLocaleString(locale).length > 10,
    before: before(Number.NaN, locale),
    after: after(Number.NaN, locale),
    changed: before(Number.NaN, locale) !== after(Number.NaN, locale),
  })),
);

then you will get

from my interpretation of the code. the goal was to format to 2 decimal places. if you can provide more context about the intent of the code then I'm sure I can adjust the options being sent into toLocaleString to match