Add Class.constants method.

[st0012]

No description provided.

[codecov]

Codecov Report

Merging #686 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #686      +/-   ##
==========================================
+ Coverage   81.99%   82.03%   +0.04%     
==========================================
  Files          57       57              
  Lines        7798     7805       +7     
==========================================
+ Hits         6394     6403       +9     
+ Misses       1133     1131       -2     
  Partials      271      271

Impacted Files	Coverage Δ
vm/class.go	85.2% <100%> (+0.47%)	⬆️

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[st0012]

@hachi8833 can you help me review this?

[hachi8833]

Very interesting. Object.constants returns an array of any constants.

[st0012]

I just found out I implemented it wrong. I should return the constants' name instead of their values

[hachi8833]

I found that Object.constants looks unstable:

» Object.constants.first
#» ZeroDivisionError
» Object.constants.first
#» Decimal
» Object.constants.first
#» Module
» Object.constants.first
#» Module
» Object.constants.first
#» ArrayEnumerator

[st0012]

@hachi8833 should be fixed now