fix some assertions in Vector_isConsistent and Vector_splice.

Vector.c

@@ -62,14 +62,6 @@ static bool Vector_isConsistent(const Vector* this) {
  assert(this->items <= this->arraySize);
  assert(!Vector_isDirty(this));
 
- if (this->owner) {
- for (int i = 0; i < this->items; i++) {
- if (!this->array[i]) {
- return false;
- }
- }
- }
-
  return true;
 }
 
@@ -396,7 +388,7 @@ int Vector_indexOf(const Vector* this, const void* search_, Object_Compare compa
 void Vector_splice(Vector* this, Vector* from) {
  assert(Vector_isConsistent(this));
  assert(Vector_isConsistent(from));
- assert(!(this->owner && from->owner));
+ assert(!this->owner);
 
  int olditems = this->items;
  this->items += from->items;