Implicit {n} only support Number, and not String

[mrleblanc101]

Reporting a bug?

Not sure if this is a bug, or a feature request.

Since $tc has been deprecated, there is very little difference between Message Format Syntax and Plurialization.

In Message Format Syntax, you can use Named interpolation ({count}) and List Interpolation ({0}), but not Implicit Interpolation. Implicit Interpolation ({n}) can only be used with Plurizalization.

Techncally, you can use Implicit Interpolation ({n}) without Plurizalization, but only if n is a Number, not if it's a String.

Input: 
<div>{{ t('Test {n}', 1) }}</div>
Output: "Test 1"

Input: 
<div>{{ t('Test {n}', "1") }}</div> 
Output: "1"

Maybe there is a good reason for it, and I don't see it, or maybe Message Format could be made to support Implicit Interpolation ({n}) with a String.

Expected behavior

Input: 
<div>{{ t('Test {n}', "1") }}</div> 
Output: "Test 1"

Reproduction

https://stackblitz.com/edit/vitejs-vite-saeaemxg?file=src%2FApp.vue

System Info

System:
    OS: macOS 15.3.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 72.06 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.18.0 - ~/.nvm/versions/node/v20.18.0/bin/node
    npm: 10.8.2 - ~/.nvm/versions/node/v20.18.0/bin/npm
  Browsers:
    Chrome: 134.0.6998.166
    Chrome Canary: 136.0.7093.0
    Edge: 134.0.3124.85
    Safari: 18.3
    Safari Technology Preview: 18.4
  npmPackages:
    vue: latest => 3.5.13

Screenshot

Additional context

No response

Validations

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[mrleblanc101]

Technically, I could just change to:
List Interpolation: {{ t('Test {0}', ["1"]) }}
Named Interpolation: {{ t('Test {count}', { count: "1" }) }}

But where this is a single argument, I prefer not using List or Named Interpolation.