Unknown Tag response to json error

[spali]

Reading unknown tag and marshal to json error:

TRAC[0000] read plain []byte{0xe3, 0xdc, 0x0, 0x11, 0x20, 0x17, 0x20, 0x66, 0x0, 0x0, 0x0, 0x0, 0xa8, 0x74, 0x58, 0x17, 0x8, 0x0, 0x7d, 0x2, 0x80, 0x1, 0x3, 0x1, 0x0, 0x0, 0x75, 0xfc, 0xe5, 0x38} 
TRAC[0000] read [{ Tag(25166461) UChar8 0 }]                        
error: json: error calling MarshalJSON for type main.JSONMessage: invalid character '2' looking for beginning of object key string

@docolli

[spali]

current theory is, that marshal of tag which would return a string as key (known tag) returns a number for an unknown tag which does marshal to a number which is an invalid json key.

[spali]

Workaround is using -output json to prevent tags getting keys