doc: impl details of `#[callback_unwrap]`#1321

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dj8yfo wants to merge 10 commits intonear:masterfrom dj8yfo:impl_details_callback_unwrap_1

+163-66

Commits on Feb 26, 2025

resolves bullet#1 in near#1265 (comment)
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resolves bullet#2 in near#1265 (comment)
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resolves bullet#4 in near#1265 (comment)
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Commits on Feb 27, 2025

example: correct a wrong example, suggesting a wrong pattern of usage
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#[callback_unwrap] impl details added
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changed referenced anchor as per changes in near#1307
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small amendments
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Commits on Feb 28, 2025

resolves near#1319 (comment)
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Commits on Mar 3, 2025

test: add asserts in callback-results example
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resolves a bullet in near#1256 about examples/adder
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