nickva commented on issue #3977:
URL: https://github.com/apache/couchdb/issues/3977#issuecomment-1083260350
@ronag The precedence is in the order the parameters are specified. For
example:
```
http $DB/db/_all_docs'?endkey="b"&key="a"&key="c"'
```
Will set endkey to `b` then set both `startkey` and `endkey` to `a` then set
both `startkey` and `endkey` to `c` and will emit `c`:
```
{
"offset": 2,
"rows": [
{
"id": "c",
"key": "c",
"value": {
"rev": "1-935564bc7ec7e86aa82ecec3face18f6"
}
}
],
"total_rows": 3
}
```
I can't think of any useful cases for this, but it has been like that for
many years. It probably should be fixed to work like `keys=[...]` and raise a
`mutually_exclusive` 400 error or some `duplicate_parameter` error and such as
well.
I marked the issue as an enhancement. It could be picked up by a beginner
contributor as it doesn't seem particularly difficult to implement. But, it
might involve some discussion on the dev ML since it's a compatibility issue.
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