Do these two expressions have differences?
<span ng-if="::ctrl.showUsername>{{::ctrl.asker.name || 'A stackoverflow participant'}}</span>
vs
<span ng-if="::ctrl.showUsername>{{ctrl.asker.name || 'A stackoverflow participant'}}</span>
Are they equivalent in meaning (i.e. only evaluated once)?
Are there any distinctions between the subsequent phrases?
Absolutely, if you wish to modify the ctrl.asker.name.
Does it carry the same connotation (i.e. assess only once)?
No, ctrl.asker.name will undergo assessment in each digest cycle, whereas ::ctrl.asker.name will cease evaluation after its first definition is established.
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