Doesn't handle promises that are functions

[chocolateboy]

“thenable” is an object or function that defines a then method.

-- https://promisesaplus.com/

So typeof p === 'object' is incomplete/incorrect:

typed-is-promise/src/index.ts

Line 5 in abf1514

return p !== null && typeof p === 'object' && typeof p.then === 'function';