collections: most functions that work on `Record` do not work with `interface`

Most of collections’ functions that work on Record do not work with interface

To Reproduce

import { deepMerge, filterEntries } from "https://deno.land/std/collections/mod.ts";

interface Foo {
  bar: string;
}

const foo1: Foo = { bar: "deno" };
const foo2: Foo = { bar: "deno" };

const a = deepMerge(foo1, foo2);
const b = filterEntries(foo1, ([key]) => key !== "a");

Expected behavior

It compiles.

Current behaviour

It does not compile.

Argument of type 'Foo' is not assignable to parameter of type 'Record<PropertyKey, unknown>'.
      Index signature is missing in type 'Foo'

Desktop (please complete the following information):

deno 1.13.0 (release, x86_64-unknown-linux-gnu)
v8 9.3.345.11
typescript 4.3.5

Additional context Possible workaround is to use type instead of interface, but that’s not ideal:

type Foo = {
  bar: string;
}

[LionC]

I agree with most, however 2 small points:

• Prefer type over interface is highly debatable. [1][2]
• type can also be extended: type Developer = Human & { usesVim: boolean }

There isn’t an elegant solution, but we can try to augment the type of functions that one might use on interfaces to help our users.

That is definitely debatable 😃

I do not think there is a reasonable solution on the API side though, so I would vote to close this issue.

[lino-levan]

I think this issue should probably be closed, though the discussion in this issue is very interesting.