Better default messages for higher order assertions?

[hailwood]

So right now we can do

expect($user)
  ->is_enabled->toBeTrue()
  ->name->toBe('Bob Smith')

And we will get an error like

Failed asserting that false is true.

or

Failed asserting that two strings are identical.

And it looks like in v2 we're going to be able to do custom messages which is great.

expect($user)
  ->is_enabled->toBeTrue('My custom message')
  ->name->toBe('Bob Smith', 'Another Message')

But it means I then need to go and look at what line it failed on and compare it to the code to see what field it failed on.
What would be awesome is if we could just do

expect($user)
  ->is_enabled->toBeTrue()
  ->name->toBe('Bob Smith')

And have the assertion key in the message - e.g.

Failed asserting that false is true for 'is_enabled'.

or

Failed asserting that two string are identical for 'name'.