hydroflow 0.3.0

Hydro's low-level dataflow runtime and IR
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# WASM

## Tests

### Setup

Install `wasm-bindgen-cli` globally: `cargo install wasm-bindgen-cli`.
`wasm-bindgen-cli` provides a test runner harness.

### Running Tests

Run (in the root hydroflow directory):

```
CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER=wasm-bindgen-test-runner cargo test --target wasm32-unknown-unknown -p hydroflow --tests
```

Flag explanation:

- `CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER=wasm-bindgen-test-runner`: Tells
  Cargo to use the test harness provided by `wasm-bindgen-cli`.
- `-p hydroflow`: Only run tests in the hydroflow directory.
- `--tests`: Only run tests; do not build examples. Many (possibly all) of the
  examples in hydroflow/examples currently do not compile to WASM because they
  use networking.


### Adding a new WASM test

Instead of the `#[test]` attribute, mark the test with the
`#[multiplaform_test]` attribute.

```rust
use multiplatform_test::multiplatform_test;

#[multiplatform_test]
fn my_test() {
  // ...
}
```