Tidy method overloading

[odow]

@lkapelevich not sure if this impacts SDDiP.jl?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@630e961). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             master     #26   +/-   ##
========================================
  Coverage          ?   84.5%           
========================================
  Files             ?      15           
  Lines             ?     755           
  Branches          ?       0           
========================================
  Hits              ?     638           
  Misses            ?     117           
  Partials          ?       0

Impacted Files	Coverage Δ
src/valuefunctions.jl	96.7% <100%> (ø)

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