Use strict in_array checks in utils

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e7a5432) 100.00% compared to head (ae95f2b) 100.00%. Report is 2 commits behind head on master.

:exclamation: Current head ae95f2b differs from pull request most recent head 50d60a5. Consider uploading reports for the commit 50d60a5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #106 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 262 262 Lines 7379 7379 ========================================= Hits 7379 7379 ``` | [Files Changed](https://app.codecov.io/gh/phug-php/phug/pull/106?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php) | Coverage Δ | | |---|---|---| | [...rc/Phug/Util/Util/Partial/ModuleContainerTrait.php](https://app.codecov.io/gh/phug-php/phug/pull/106?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php#diff-c3JjL1BodWcvVXRpbC9VdGlsL1BhcnRpYWwvTW9kdWxlQ29udGFpbmVyVHJhaXQucGhw) | `100.00% <100.00%> (ø)` | | | [src/Phug/Util/Util/Partial/OptionTrait.php](https://app.codecov.io/gh/phug-php/phug/pull/106?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php#diff-c3JjL1BodWcvVXRpbC9VdGlsL1BhcnRpYWwvT3B0aW9uVHJhaXQucGhw) | `100.00% <100.00%> (ø)` | | | [src/Phug/Util/Util/Partial/StaticMemberTrait.php](https://app.codecov.io/gh/phug-php/phug/pull/106?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=phug-php#diff-c3JjL1BodWcvVXRpbC9VdGlsL1BhcnRpYWwvU3RhdGljTWVtYmVyVHJhaXQucGhw) | `100.00% <100.00%> (ø)` | |

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.