TypeScript IntelliSense support less valid variable unicode identifier than tsc

[npc1054657282]

Code

let let big𒊹f = 4;
console.log(big𒊹f);
//4

"𒊹" is a valid identifier unicode, in https://www.typescriptlang.org/play, it works normally. But in vscode JavaScript and TypeScript Nightly extension, an error "Invalid character.ts(1127)" will show.