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Method documentation is missing this part

I'd say it has to, otherwise it cannot know, can it?

value provider could be wrapped in some container like Java

Optional

that may indicate no value provider is available or some is set. But from the Gradle code I see it is not the case here and code triggers value calculation

I'm not sure what you mean. If the provider calculates to

null

,

isPresent()

returns

false

, so you cannot say whether it is present without calculating.