Dot11Type MainType() Function Does Not Return `Mgmt`

[ChuckLangford]

New to both Go and this library so, perhaps I've missed something. Here's a simple example of what I'm seeing:

packet := gopacket.NewPacket(
	data,
	layers.LayerTypeRadioTap,
	gopacket.DecodeOptions{Lazy: true, NoCopy: true},
)

// retrieve the dot11 layer
dot11Layer := packet.Layer(layers.LayerTypeDot11)
if dot11Layer == nil {
	log.Fatalf("No 802.11 layer found in packet %d", i)
}
dot11, ok := dot11Layer.(*layers.Dot11)

fmt.Printf("MainType: %s\n", dot11.Type.MainType())
fmt.Printf("Type: %s\n", dot11.Type)

From this, I get the following output:

MainType: MgmtAssociationReq
Type: MgmtBeacon

According to the docs I would have expected the MainType value to be something like Mgmt. https://github.com/google/gopacket/blob/v1.1.19/layers/enums.go#L214

Inspecting the library code, I believe I see that Mgmt is actually never going to be returned? The Dot11TypeMetadata slice doesn't actuallly have an entry for Dot11TypeMgmt. This appears to be related to the fact that the following two values are the same?

...
Dot11TypeMgmt     Dot11Type = 0x00
...
Dot11TypeMgmtAssociationReq    Dot11Type = 0x00
...

So when the MainType function applies it's masking it can only mask to a single value? If all of that is true, it feels like there's a reason or maybe some history in why the Mgmt type isn't represented when calling MainType.

Does anyone have any insights on this? Have I missed something? Most importantly, if I want to determine the MainType value to be one of management, control, or data, should I code against the currently returned value of MgmtAssociationReq? Or should I perhaps look at the integer representations of these values instead?

Thanks for your insights.