ReadableStreamDefaultControllerCallback/UnderlyingSourcePullCallback<string>.enqueue "not callable" type checking error in 1.45.3

[valpackett]

Version: Deno 1.45.3

#24599 has introduced a very strange typechecking error to my usage of the ReadableStream API:

full code for reference

Check file:///home/val/src/codeberg.org/valpackett/tiddlypwa/server/app.ts
error: TS2345 [ERROR]: Argument of type 'string' is not assignable to parameter of type 'ArrayBufferView & string'.
  Type 'string' is not assignable to type 'ArrayBufferView'.
                        ctrl.enqueue(`{"appEtag":${JSON.stringify(appEtag)},"serverChanges":[`);
                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at file:///home/val/src/codeberg.org/valpackett/tiddlypwa/server/app.ts:122:17

TS2345 [ERROR]: Argument of type 'string' is not assignable to parameter of type 'ArrayBufferView & string'.
                                                (firstWritten ? '\n,' : '\n') + JSON.stringify({
                                                ^
    at file:///home/val/src/codeberg.org/valpackett/tiddlypwa/server/app.ts:131:7

TS2345 [ERROR]: Argument of type 'string' is not assignable to parameter of type 'ArrayBufferView & string'.
  Type 'string' is not assignable to type 'ArrayBufferView'.
                        ctrl.enqueue('\n]}');
                                     ~~~~~~
    at file:///home/val/src/codeberg.org/valpackett/tiddlypwa/server/app.ts:156:17

Found 3 errors.

Interestingly the LSP server reports it completely differently, in a way that makes more sense than just somehow deriving an intersection type:

This expression is not callable. Each member of the union type '{ (chunk: ArrayBufferView): void; (chunk: ArrayBufferView): void; } | { (chunk?: string | undefined): void; (chunk?: string | undefined): void; }' has signatures, but none of those signatures are compatible with each other.

soooo… that doesn't look good 🤔