== should format the different kinds of keys ==
key1    =    "value"
key2-dash   =   "value"
key3_underscore   =   "value"
key4.dotted   =  "value"
key5 . dotted   =   "value"
"key6"   =   "value"
"" = "" # comment

[expect]
key1 = "value"
key2-dash = "value"
key3_underscore = "value"
key4.dotted = "value"
key5.dotted = "value"
"key6" = "value"
"" = "" # comment