Increased flexibility for integer values

[eddelbuettel]

cf #56, two commits already rebased

[codecov-io]

Codecov Report

Merging #57 into master will increase coverage by 1.57%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #57      +/-   ##
========================================
+ Coverage   98.42%   100%   +1.57%     
========================================
  Files           4      4              
  Lines         190    190              
========================================
+ Hits          187    190       +3     
+ Misses          3      0       -3

Impacted Files	Coverage Δ
src/anytime.cpp	100% <0%> (+2.05%)	✅

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