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Template Literal with infer does not handle surrogate pairs
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**TypeScript Version:** 4.1.0-dev.20201015
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
template literal, surrogate pair, infer
**Code**
```ts
type Head<StrT extends string> = StrT extends `${infer HeadT}${string}` ? HeadT : never;
type Tail<StrT extends string> = StrT extends `${string}${infer TailT}` ? TailT : never;
type TestHead = Head<"𡁻">
type TestTail = Tail<"𡁻">
```
**Expected behavior:**
Should handle surrogate pairs properly
**Actual behavior:**


**Playground Link:**
[Playground](https://www.typescriptlang.org/play?ts=4.1.0-dev.20201015#code/FAFwngDgpgBAElAhgEwDwGUQCcAqMoAeIUAdsgM4znYCWJA5gHwwC8Mmu+RpFMABgBIA3nQBmULPCTIcAX2HUsderL4wA-FJR4AXDBJQAbhIDcwUJFg5ENADYZseQsTKVFy5mw5Pur-gtoGeREScUlrOzk1TQjbXX0jU3NwaBgcKGoEFFYtNAAiQBENwG8dvMYLVPTqWJzY1EKSxiA)
**Related Issues:**
Searched for "template literal surrogate pair" and didn't find anything
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