"All keys in the square bracket notation are converted to strings, unless they're Symbols. JavaScript object property names (keys) can only bestrings or Symbols. … JavaScript will call the anotherObj.toString() method, and use this result string as the new key."
So TypeScript will also allow string | number as a Key type but the distinct values 10 and "10" will always map to the same key "10".
If it is necessary to use types other than string or Symbol as a Key consider using the Map type instead:
"A Map's keys can be any value (including functions, objects, or any primitive)."
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Even the TypeScript documentation is sloppy here.
Ultimately Records are always based on plain JavaScript objects:
"All keys in the square bracket notation are converted to strings, unless they're Symbols. JavaScript object property names (keys) can only be strings or Symbols. … JavaScript will call the anotherObj.toString() method, and use this result string as the new key."
So TypeScript will also allow
string | numberas aKeytype but the distinct values10and"10"will always map to the same key"10".If it is necessary to use types other than
stringorSymbolas aKeyconsider using theMaptype instead:"A
Map's keys can be any value (including functions, objects, or any primitive)."