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Merge maps and lists in YAML blocks instead of left-biased union #4057

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na-sa-do opened this issue Nov 9, 2017 · 1 comment
Open

Merge maps and lists in YAML blocks instead of left-biased union #4057

na-sa-do opened this issue Nov 9, 2017 · 1 comment
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enhancement

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@na-sa-do
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na-sa-do commented Nov 9, 2017

Always ignoring extant keys (pure left-biased union) can be a bit counterintuitive. It may be better to merge the contents of mappings and lists, then use left-biased union for conflicting scalar values, so that

---
one:
    first: 1
---
---
one:
    first: 2
    second: 3
---

should simplify to

---
one:
    first: 1
    second: 3
---
@jgm
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jgm commented May 5, 2018

See #3115 which seems to be a related issue.

@the-solipsist the-solipsist mentioned this issue Aug 25, 2020
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@jgm @mb21 @na-sa-do