Do not replace .unwrap_or(vec![]) by .unwrap_or_default()
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`.unwrap_or(vec![])` is as readable as `.unwrap_or_default()`.
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.unwrap_or(vec![])is as readable as.unwrap_or_default().Also, this ensures by adding tests that expressions such as
.unwrap_or(DEFAULT_LITERAL)(0,"", etc.) are not replaced by.unwrap_or_default()either.Related to the discussion in the Zulip discussion about PR #15037.
changelog: [
unwrap_or_default]: do not replace.unwrap_or(vec![])by.unwrap_or_default()