Removing (with del) multiple items from an array can result in indexing problems

[nicktimko]

Describe the bug
If removing multiple elements from an array, it seems like yq is computing where they are before doing any of the modifications, then removing those indicies, but as they get removed, the previously-calculated indicies are wrong.

Note that any how to questions should be posted in the discussion board and not raised as an issue.

Version of yq: 4.43.1
Operating system: macOS 14.4.1
Installed via: Homebrew

Input Yaml
names.yml:

{"ppl":[{"name":"alice"},{"name":"bob"},{"name":"charlie"},{"name":"deb"}]}

Script

#!/bin/bash

input='{"ppl":[{"name":"alice"},{"name":"bob"},{"name":"charlie"},{"name":"deb"}]}'
tmp_names=/tmp/names
jq <<<$input >$tmp_names.json

python3 -c "import platform;print(platform.platform())"
jq --version
yq --version

jq 'del(.ppl[] | select(.name == "alice")) | del(.ppl[] | select(.name == "bob"))' $tmp_names.json
yq 'del(.ppl[] | select(.name == "alice")) | del(.ppl[] | select(.name == "bob"))' $tmp_names.json
yq 'del(.ppl[] | select(.name == "bob")) | del(.ppl[] | select(.name == "alice"))' $tmp_names.json

Output

macOS-14.4.1-arm64-arm-64bit
jq-1.7.1
yq (https://github.com/mikefarah/yq/) version v4.43.1
{
  "ppl": [
    {
      "name": "charlie"
    },
    {
      "name": "deb"
    }
  ]
}
{
  "ppl": [
    {
      "name": "bob"  # [Ed: added comment] !!!
    },
    {
      "name": "deb"
    }
  ]
}
{
  "ppl": [
    {
      "name": "charlie"
    },
    {
      "name": "deb"
    }
  ]
}

Additional context
Feels kinda like this toy Python example, though here it will blow up if it tries to remove an out-of-bounds index, while if you change "bob" to "deb" in the yq example, then you wind up with it outputting bob/charlie/deb.

a = ['a', 'b', 'c', 'd']
to_remove = ['a', 'b']
for idx in [a.index(x) for x in to_remove]:
    a.pop(idx)
print(a)  #>>> ['b', 'd']