What is the difference between uintX_n (used in IDA Pro) and unitX_t types?

During debugging a binary in IDA Pro, I’ve noticed types of the form

30  uint16_n                            00000002                struct {uint16_t inner;}
42  uint32_n                            00000004                struct {uint32_t inner;}

where the fields in each row from left to right correspond to Ordinal, name, size, description in the Local Types subview of IDA Pro. While the sizes seem to match the uintX_t counterparts, I would appreciate it if someone can explain the reasoning for introducing uintX_n types and the difference they have with the well known uintX_t types in which X=8,16,32.