Simplest example not working with 0.42 on osx

[porttack]

x.yaml:

a: 1
b: 2

Now run ytt --data-value a=3 -f x.yaml and I still see a: 1. Seems like a great tool, but I'm at a loss.

[mamachanko]

Data values are what you want. Try this:

#! x.yaml

#@ load("@ytt:data", "data")

a: #@ data.values.a

Now, run ytt --data-value a=3 -f x.yaml and you should see a: 3.