New File API class based typing

[jelly]

This seems to be promising except we can't generalize the creation of the Channel class...

         const channel = new Channel<ReadReturnType<T>>({ ...global_options, ...options, payload: 'fsread1', binary: this.#binary });

So that is slightly uncool, but maybe there is some magical way?

the error:

not ok 10 /static-code/test-typescript
# src/path.ts(53,75): error TS2345: Argument of type '{ payload: string; binary: boolean; max_read_size?: number; path: string; command?: never; channel?: never; host?: string; superuser?: "try" | "require"; }' is not assignable to parameter of type 'ChannelOpenOptions<T extends true ? Uint8Array<ArrayBufferLike> : string>'.
#   Type '{ payload: string; binary: boolean; max_read_size?: number; path: string; command?: never; channel?: never; host?: string; superuser?: "try" | "require"; }' is not assignable to type 'ChannelOptions<T extends true ? Uint8Array<ArrayBufferLike> : string>'.