Forward bounds argument

[VisruthSK]

Closes #317.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.15385% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.58%. Comparing base (d6e83fd) to head (1602181).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
R/helpers-shared.R	71.42%	2 Missing ⚠️
R/mcmc-intervals.R	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
- Coverage   98.66%   98.58%   -0.08%     
==========================================
  Files          35       35              
  Lines        6125     5789     -336     
==========================================
- Hits         6043     5707     -336     
  Misses         82       82              

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