More friendly explanation for `:malli.core/invalid-type`

Hi!

The following:

(malli.error/humanize
 (malli.core/explain [:sequential :string] #{"a"}))

returns "invalid-type". That could be improved in a couple ways:

• it could say expected :sequential, got :set
  • i.e. mention the two specific types involved in the type mismatch.
• additionally, or instead (for agility's sake), say there was a type mismatch for this value
  • while it might look like simply like a verbose rewording of "invalid type", it actually would make it evident that the value is wrong, not the schema itself (which is what I mistakenly believed while debugging this).

wdyt?

Thanks - V