A string goal with actionlib

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I'm just starting out with ROS actions. The example uses the goal type uint32, but I wanted to use a std_msgs::String. This is my action file:

# Define the goal
string sequence_name  # Name the sequence to run, e.g. "turn handle clockwise"
---
# Define the result (typically an incremental result, but just boolean in this case)
bool in_progress
---
# Define a feedback message
bool success

Although I stated "string" for the goal, it looks like the goal message compiles as an unsigned int type. Passing an int argument like this compiles successfully:

temoto::PreplannedSequenceGoal goal;
goal.sequence_name = 1;
preplanned_sequence_client_.waitForServer();
preplanned_sequence_client_.sendGoal(goal);

Whereas passing a std_msgs::String does not compile (type mismatch).

So, in short, can I use datatypes other than uint32 and float32 for the Action message components?