曲线求交类型

[uuid(B251ECE2-80B2-47B9-A3EE-36097929324E), helpstring("McExtendOption")]
enum McExtendOption {
  mcExtendNone = 0,
  mcExtendThisEntity = 1,
  mcExtendOtherEntity = 2,
  mcExtendBoth = 3
};