Add type casts to normalize saved front matter publication data

[caendesilva]

No description provided.

[codecov]

Codecov Report

Merging #788 (be193bc) into publications-feature (f9f30f7) will decrease coverage by 0.08%.
The diff coverage is n/a.

❗ Current head be193bc differs from pull request most recent head aa2117f. Consider uploading reports for the commit aa2117f to get more accurate results

@@                    Coverage Diff                     @@
##             publications-feature     #788      +/-   ##
==========================================================
- Coverage                  100.00%   99.91%   -0.09%     
+ Complexity                   2796     1402    -1394     
==========================================================
  Files                         324      162     -162     
  Lines                        7028     3522    -3506     
==========================================================
- Hits                         7028     3519    -3509     
- Misses                          0        3       +3     

Impacted Files	Coverage Δ
...rc/Framework/Actions/CreatesNewPublicationPage.php	90.62% <0.00%> (-9.38%)	⬇️
...rc/Framework/Actions/CreatesNewPublicationPage.php
...c/Framework/Actions/CreatesNewMarkdownPostFile.php
...work/src/Framework/Features/Navigation/NavItem.php
packages/framework/src/Pages/HtmlPage.php
...amework/src/Console/Concerns/ValidatingCommand.php
...rc/Framework/Services/YamlConfigurationService.php
packages/framework/src/Facades/Asset.php
...work/src/Framework/Concerns/ValidatesExistence.php
...c/Framework/Features/Templates/PublishableView.php
... and 153 more

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