wasm-bindgen 0.2.47

Easy support for interacting between JS and Rust.
Documentation 
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export function test_string_roundtrip(f) {
  const test = expected => {
    const actual = f(expected);
    if (actual === expected)
      return;
    throw new Error(`string roundtrip "${actual}" != "${expected}"`);
  };

  test('');
  test('a');
  test('💖');

  test('a longer string');
  test('a longer 💖 string');
}