<@U2EEGJYM6> ``` ** * unwrap companion class ...

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@tokuhirom

**
     * unwrap companion class to enclosing class given a Java Class
     */
    inline private fun <T : Any> unwrapCompanionClass(clazz: Class<T>): Class<*> {
        if (clazz.enclosingClass != null) {
            try {
                val field = clazz.enclosingClass.getField(clazz.simpleName)
                if (Modifier.isStatic(field.modifiers) && field.type == clazz ) {
                    // && field.get(null) === obj
                    // the above might be safer but problematic with initialization order
                    return clazz.enclosingClass
                }
            } catch(e: Exception) {
                //ok, it is not a companion object
            }
        }
        return clazz
    }