`symbol` does not match interface

TypeScript Version: playground and 3.3

Search Terms: symbol interface

Code

const sym: symbol = Symbol();

function f(arg: { constructor?: unknown }): void {
}

f(sym);

Expected behavior:
symbol is a non-nullish primitive, as such, it should be able to potentially match any interface.

Actual behavior:
Type error.

Playground Link: https://www.typescriptlang.org/play/#src=const%20sym%3A%20symbol%20%3D%20Symbol()%3B%0D%0A%0D%0Afunction%20f(arg%3A%20%7B%20constructor%3F%3A%20unknown%20%7D)%3A%20void%20%7B%0D%0A%7D%0D%0A%0D%0Af(sym)%3B

Related Issues: #29536 (discovered in relation to #28900), #1863, #24587

Start by reproducing the provided example in the linked TypeScript Playground and review the related issues for the intended assignability behavior. Trace the compiler's handling of symbol values against the { constructor?: unknown } interface, then add a regression test and verify that the example type-checks without weakening unrelated type rules.