🪲 [Fix]: Multi-select custom properties no longer lose individual values

[Marius Storhaug (MariusStorhaug)]

Multi-select custom property values are now correctly preserved as arrays. Previously, properties with multiple selections (e.g., ["Custom Instructions", "License", "Prompts"]) were silently collapsed into a single space-joined string ("Custom Instructions License Prompts"), making it impossible to iterate over individual selections downstream.

Fixed: Multi-select custom property values collapsed into a single string

Commands that return repository custom properties (such as Get-GitHubRepository and Get-GitHubRepositoryCustomProperty) now preserve array values for multi-select properties. Each selection is available as a separate string element, so downstream logic that iterates over values works correctly.

$repo = Get-GitHubRepository -Owner 'MyOrg' -Name 'MyRepo'
$repo.CustomProperties | Where-Object Name -EQ 'SubscribeTo'

# Before (broken):
# Name        Value
# ----        -----
# SubscribeTo Custom Instructions License Prompts

# After (correct):
# Name        Value
# ----        -----
# SubscribeTo {Custom Instructions, License, Prompts}

# Individual values are now accessible:
$prop.Value[0]  # "Custom Instructions"
$prop.Value[1]  # "License"
$prop.Value[2]  # "Prompts"

Single-select and text custom properties continue to work as before — their values remain plain strings.

Technical Details

• GitHubCustomProperty.Value type changed from [string] to [object] to allow both scalar strings and string arrays.
• The constructor now checks whether the raw value implements IEnumerable (excluding string). If so, it casts to [string[]]; otherwise it assigns the value directly.
• Unit tests added covering multi-select array preservation, scalar string pass-through, and GraphQL-style property name resolution.

[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

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Pull request overview

Fixes a bug in the repository custom properties model where multi-select custom property values returned as arrays by the GitHub API were being coerced into a single space-joined string, preventing correct downstream iteration.

Changes:

• Changed GitHubCustomProperty.Value from [string] to [object] to allow array values.
• Updated the GitHubCustomProperty constructor to detect non-string enumerables and cast them to [string[]].

[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

All files and directories linted successfully

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[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

All files and directories linted successfully

For more information, see the GitHub Actions workflow run

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