The `delimiter` attribute of `<group>` is not applied to items inside `<choose>`

[csimide]

Consider the following CSL snippet:

<group delimiter=". ">
  <text value="v0"/> 
  <text value="v1"/>
  <choose>
    <if type="book">
      <text value="v2"/>
      <text value="v3"/>
    </if>
  </choose>
</group>

The complete test CSL file

<?xml version="1.0" encoding="utf-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" version="1.0" class="in-text" name-as-sort-order="all" sort-separator=" " demote-non-dropping-particle="never" initialize-with=" " initialize-with-hyphen="false" page-range-format="expanded" default-locale="zh-CN">
  <info>
    <title>test</title>
    <id>http://test</id>
    <category citation-format="numeric"/>
    <category field="generic-base"/>
  </info>
  <macro name="entry-layout">
    <group delimiter=". ">
      <text value="v0"/> 
      <text value="v1"/>
      <choose>
        <if type="book">
          <text value="v2"/>
          <text value="v3"/>
        </if>
      </choose>
    </group>
  </macro>
  <citation collapse="citation-number" after-collapse-delimiter=",">
    <sort>
      <key variable="citation-number"/>
    </sort>
    <layout vertical-align="sup" delimiter="," prefix="[" suffix="]">
      <text variable="citation-number"/>
    </layout>
  </citation>
  <bibliography>
    <layout>
      <text variable="citation-number" prefix="[" suffix="]"/>
      <text macro="entry-layout"/>
    </layout>
  </bibliography>
</style>

Expected reference output: v0. v1. v2. v3
Actual reference output in Typst: v0. v1. v2v3

I noticed that when <group> contains <choose>, the group delimiter is not applied to elements inside <choose>. Instead, <choose> is treated as a group without a delimiter.

This behavior is inconsistent with reference management software like Zotero. In the CSL 1.0.2 documentation, it is stated:

Delimiters from the nearest delimiting element are applied within the output of cs:choose (i.e., the output of the matching cs:if, cs:else-if, or cs:else; see delimiter).

src: https://docs.citationstyles.org/en/stable/specification.html#choose

---

P.S. Currently, this issue can be mitigated by nesting <group delimiter=". "> inside <choose>. However, this means that additional modifications to the CSL are required for it to work with Typst.

Example

<group delimiter=". ">
  <text value="v0"/> 
  <text value="v1"/>
  <choose>
    <if type="book">
      <group delimiter=". "> <!-- Add a nested group -->
        <text value="v2"/>
        <text value="v3"/>
      </group>  <!-- Add a nested group -->
    </if>
  </choose>
</group>