Fix `is_arranged`, edge data accessors for mixed vertex tuple types

[codecov-commenter]

Codecov Report

Merging #17 (8203441) into main (07bf93b) will increase coverage by 0.88%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   50.00%   50.88%   +0.88%     
==========================================
  Files           5        5              
  Lines         280      283       +3     
==========================================
+ Hits          140      144       +4     
+ Misses        140      139       -1     

Impacted Files	Coverage Δ
src/arrange.jl	95.45% <100.00%> (+0.71%)	:arrow_up:

... and 1 file with indirect coverage changes

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