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Cliff ArmstrongCliff Armstrong 

Lightning Component Unbound Doesn't Work

I tried the example for Unbound Expressions, {#v.parentAttr} in particular, in this Trailhead module (https://developer.salesforce.com/trailhead/lightning_components/lightning_components_expressions) and it doesn't seem to work.  It just renders the literal string "{#v.parentAttr}"

The bound expression, {!v.childAttr}, works correctly and renders the expression value.

Has anyone gotten the unbound expression to work correctly?