preserve numeric inputs (closes #68)

[eddelbuettel]

No description provided.

[codecov-io]

Codecov Report

Merging #69 into master will decrease coverage by 0.45%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage     100%   99.54%   -0.46%     
==========================================
  Files           4        4              
  Lines         215      218       +3     
==========================================
+ Hits          215      217       +2     
- Misses          0        1       +1

Impacted Files	Coverage Δ
src/anytime.cpp	99.42% <100%> (-0.58%)	⬇️

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