About types from natives.galaxy

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// About Types
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//
// -- Complex types and automatic deletion --
//
// Many native types represent "complex" objects (i.e. larger than 4 bytes).  The script language
// automatically keeps track of these objects and deletes them from memory when they are no longer
// used (that is, when nothing in the script references them any longer).  The types which benefit
// from automatic deletion are:
//
//      abilcmd, bank, camerainfo, marker, order, playergroup, point,
//      region, soundlink, string, text, timer, transmissionsource, unitfilter, unitgroup, unitref,
//      waveinfo, wavetarget
//
// Other object types must be explicitly destroyed with the appropriate native function when you
// are done using them.