fn getCapacity(comptime ComponentLists: type, comptime T: type) usize {
  comptime var capacity: usize = 0;
  inline for (@typeInfo(ComponentLists).Struct.fields) |sfield| {
    comptime if (std.mem.eql(u8, sfield.name, @typeName(T))) {
      capacity = sfield.field_type.capacity;
    };
  }
  return capacity;
}