Updated how ´contract()´ function checks if 'mdate' object has been expanded

[henriquesposito]

Description

This patch PR fixes issues with class and string comparison for CRAN resubmission by updating ´contract()´ function.

Functions

• Updated how ´contract()´ function checks if 'mdate' object has been expanded

Checklist:

• [ ] PR form
  • [ ] I have given this pull request an informative title
  • [ ] Description above itemizes changes under subtitles, e.g. "## Collection""
  • [ ] Any closed, fixed, or related issues are referenced and explained in the description above, e.g. "Fixed #0 by adding A"
  • [ ] Package builds on my OS without issues
• [ ] PR checks all pass for latest commit
  • [ ] Package builds on Mac
  • [ ] Package builds on Windows
  • [ ] Package builds on Linux
  • [ ] CodeCov check: Package improves or maintains good test coverage
  • [ ] CodeFactor check: Package improves or maintains good style
• [ ] Documentation
  • [ ] Any new or modified functions or data have roxygen style documentation in their .R scripts
  • [ ] Any longer functions are commented inline so that it is easier to debug in the future
  • [ ] PR description above and the NEWS.md file are aligned
  • [ ] DESCRIPTION file version is bumped by the appropriate increment (major, minor, patch)

[codecov[bot]]

Codecov Report

Merging #71 (8f9448f) into main (8781cc3) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   89.28%   89.28%           
=======================================
  Files          12       12           
  Lines         887      887           
=======================================
  Hits          792      792           
  Misses         95       95           

Impacted Files	Coverage Δ
R/contract.R	97.87% <100.00%> (ø)

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