Getting ASSERT: "casted->type == SInt32Type" when bitwise ORing with 0 in Javascript

[infinicat]

Using the new Qt 5.4. This issue did not happen in Qt 5.3.2.

I have Javascript code that retrieves the integer part of a floating point by bitwise ORing with 0. I use QJSEngine to evaluate the code. When running a Debug build, I'm getting this assertion:
"ASSERT: "casted->type == SInt32Type" in file compiler\qv4ssa.cpp, line 4065"

Example code:
@
QJSEngine engine;
QString jsCode = "var n = 0.1; var test = (n*255) | 0;";
QJSValue result = engine.evaluate( jsCode );
@

I've noticed two things:

1. This assertion only happens when there is a variable or function call involved. That is, the assertion does not happen if the operation is only with constants like: var test = (0.1 * 255) | 0;
2. This assertion also only happens when ORing with 0. If I change code to OR with 1, assertion does not occur.

Is this a bug?

[revflex]

I'm seeing this same issue also when using QtCanvas3D + latest three.js on Windows..

[revflex]

Created bug for this: https://bugreports.qt-project.org/browse/QTBUG-43309