Get the full type signature using ghc-mod (M-x ghc-show-type)

Question

Consider Foo.hs:

module Foo where

foo :: Num t => t
foo = 3

running ghc-mod -type on it like this only gives me the type t for the signature of foo, even though the declaration already has the full type signature attached to it:

$ ghc-mod type src/Foo.hs 4 1
4 1 4 8 "t"

This becomes highly limiting when wanting to use ghc-mod for adding a type to a declaration without one.

Is there a way to get the full type from ghc-mod?

Alternatively, what are the tools one can use in place of ghc-mod to achieve this? Can these tools be used alongside with ghc-mod, (for example in Emacs)?

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EDIT: stack-ide too reports the type to be just t not the full Num t => t:

[nil] -> {"tag":"RequestGetExpTypes","contents":{"spanFilePath":"src\/Foo.hs","spanFromLine":4,"spanFromColumn":1,"spanToLine":4,"spanToColumn":4}}
 <- {"tag":"ResponseGetExpTypes","contents":[["t",{"spanFromLine":4,"spanFilePath":"src/Foo.hs","spanToColumn":4,"spanFromColumn":1,"spanToLine":4}]]}