private static boolean areSignaturesEqualLightweight(@NotNull MethodSignature sig1, @NotNull MethodSignature sig2) {
    final boolean isConstructor1 = sig1.isConstructor();
    final boolean isConstructor2 = sig2.isConstructor();
    if (isConstructor1 != isConstructor2) return false;

    if (!isConstructor1 || !(sig1 instanceof HierarchicalMethodSignature || sig2 instanceof HierarchicalMethodSignature)) {
      final String name1 = sig1.getName();
      final String name2 = sig2.getName();
      if (!name1.equals(name2)) return false;
    }

    final PsiType[] parameterTypes1 = sig1.getParameterTypes();
    final PsiType[] parameterTypes2 = sig2.getParameterTypes();
    if (parameterTypes1.length != parameterTypes2.length) return false;

    // optimization: check for really different types in method parameters
    for (int i = 0; i < parameterTypes1.length; i++) {
      final PsiType type1 = parameterTypes1[i];
      final PsiType type2 = parameterTypes2[i];
      if (type1 instanceof PsiPrimitiveType != type2 instanceof PsiPrimitiveType) return false;
      if (type1 instanceof PsiPrimitiveType && !type1.equals(type2)) return false;
    }

    return true;
  }
private static boolean areSignaturesEqualLightweight(@NotNull MethodSignature sig1, @NotNull MethodSignature sig2)