Handling Encoding/Decoding of `instanceof` in Schema

What pointers on how schema handles encoding/decoding of instanceofs?

For example

const MyStruct = Schema.Struct({
  MyThing = Schema.instanceOf(ImageBitmap)
})

const MyStruct = Schema.Struct({
  MyThing = Schema.instanceOf(ImageBitmap)
})

what is the default, and how would you override it?

Handling Encoding/Decoding of `instanceof` in Schema - Effect Community