Maybe jsinterop.base library has some utility methods for cross casting.
Otherwise your options probably are (all untested):
1.) create a JavaScript file with a function that creates the array, then
use JsInterop to call that function.
2.) If you want it to be more generic and super unsafe you can probably
also write something like:
In utils.js:
window.apputils.reinterpret = function(o) {
return o;
}
In Java:
@JsMethod(namespace="apputils")
public static native <I, O> O reinterpret(I object);
byte[] bytes = reinterpret(new Int8Array(8));
This should allow you to reinterpret any java type without any cast
checking by GWT.
3.) If you don't want to create an external JavaScript file then you
probably have to try casting, e.g.
public byte[] createFastInt8(int size) {
return (byte[]) (Object) new Int8Array(size);
};
-- J.
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