Feature/always int64

[knapply]

Addressing #54.

@eddelbuettel, It also expands test coverage and makes some minor tweaks to existing ones as I needed to add tests for this anyways.

It's not remotely a rush - I just wanted to get it here while I'm still thinking about it.

[codecov]

Codecov Report

Merging #55 into master will increase coverage by 8.42%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   84.15%   92.58%   +8.42%     
==========================================
  Files          18       18              
  Lines        1218     1321     +103     
==========================================
+ Hits         1025     1223     +198     
+ Misses        193       98      -95     

Impacted Files	Coverage Δ
inst/include/RcppSimdJson/deserialize/vector.hpp	96.87% <ø> (+0.20%)	⬆️
src/internal-utils.cpp	98.11% <ø> (+3.66%)	⬆️
R/fload.R	100.00% <100.00%> (+3.84%)	⬆️
R/fparse.R	100.00% <100.00%> (+3.57%)	⬆️
inst/include/RcppSimdJson/deserialize.hpp	86.78% <100.00%> (+23.21%)	⬆️
...t/include/RcppSimdJson/deserialize/Type_Doctor.hpp	100.00% <100.00%> (+4.60%)	⬆️
...nst/include/RcppSimdJson/deserialize/dataframe.hpp	97.80% <100.00%> (+27.80%)	⬆️
inst/include/RcppSimdJson/deserialize/matrix.hpp	100.00% <100.00%> (ø)
inst/include/RcppSimdJson/deserialize/simplify.hpp	100.00% <100.00%> (ø)
inst/include/RcppSimdJson/utils.hpp	98.75% <100.00%> (+2.45%)	⬆️
... and 10 more

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[eddelbuettel]

Looks fab at a first glance. I'll try to come back to it in a day or two.

[eddelbuettel]

Impressive as usual, can't see anything to nag about :)