Fix/matching by col numeric

[jefferis]

• Fixes #503
• but we still need to sort out numeric ids like 1e5, since:

> as.character(1e5)
[1] "1e+05"

[codecov[bot]]

Codecov Report

Merging #504 (2b36409) into master (49d578d) will increase coverage by 1.14%. The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master     #504      +/-   ##
==========================================
+ Coverage   75.73%   76.88%   +1.14%     
==========================================
  Files          48       48              
  Lines        5906     5914       +8     
==========================================
+ Hits         4473     4547      +74     
+ Misses       1433     1367      -66     

Impacted Files	Coverage Δ
R/neuronlist.R	80.86% <70.00%> (-0.44%)	:arrow_down:
R/neuron-io.R	84.71% <0.00%> (+1.55%)	:arrow_up:
R/amiralandmarks-io.R	90.74% <0.00%> (+9.25%)	:arrow_up:
R/neuronlistfh.R	79.47% <0.00%> (+30.52%)	:arrow_up:

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[dokato]

Doesn't as.character(bit64::as.integer64((x))) solve the problem?