Remove composition

[mofeing]

As discussed in #30, this PR removes composition for the time being as the behavior of the current implementation is not well-defined and adds little value.

It can be readded in a future minor version.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.89%. Comparing base (33984fb) to head (be9bb17).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
- Coverage   87.05%   85.89%   -1.17%     
==========================================
  Files           2        1       -1     
  Lines          85       78       -7     
==========================================
- Hits           74       67       -7     
  Misses         11       11              

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