ICU MessageFormat — Apostrophe and brace quoting

{
  "locale": "en",
  "format": "icu-messageformat",
  "note": "In ICU MessageFormat, '#' inside a plural branch binds to the NEAREST enclosing plural argument, not the outermost one. Where an outer count must appear inside an inner plural, these messages use the explicit {name} form instead of '#'.",
  "messages": {
    "literalBraces": "'{'not an argument'}' but this is: {value}",
    "apostrophe": "It''s the user''s file",
    "quotedHash": "{count, plural, other {'#' is literal here, # is the number}}",
    "notQuoted": "Percent 50% and a lone apostrophe in a word like don't stay literal",
    "quotedPound": "{count, plural, other {Issue '#'# was filed}}"
  },
  "cases": [
    {
      "message": "literalBraces",
      "args": {
        "value": "42"
      },
      "expected": "{not an argument} but this is: 42"
    },
    {
      "message": "apostrophe",
      "args": {},
      "expected": "It's the user's file"
    },
    {
      "message": "quotedHash",
      "args": {
        "count": 7
      },
      "expected": "# is literal here, 7 is the number"
    },
    {
      "message": "notQuoted",
      "args": {},
      "expected": "Percent 50% and a lone apostrophe in a word like don't stay literal"
    },
    {
      "message": "quotedPound",
      "args": {
        "count": 3
      },
      "expected": "Issue #3 was filed"
    }
  ],
  "feature": "ICU apostrophe and brace quoting"
}