Add PeekAll method

[erni27]

This PR:

• adds PeekAll method

Partially fixes: #54

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9ae8586) 95.84% compared to head (fe8d312) 95.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   95.84%   95.59%   -0.25%     
==========================================
  Files           6        6              
  Lines        1034     1067      +33     
==========================================
+ Hits          991     1020      +29     
- Misses         38       41       +3     
- Partials        5        6       +1     

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