Follow ups for 64 bit change

[jeromekelleher]

Closes #1628

[codecov]

Codecov Report

Merging #1651 (a6d8984) into main (03a4472) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head a6d8984 differs from pull request most recent head 05b5f18. Consider uploading reports for the commit 05b5f18 to get more accurate results

@@           Coverage Diff           @@
##             main    #1651   +/-   ##
=======================================
  Coverage   93.72%   93.72%           
=======================================
  Files          27       27           
  Lines       23322    23326    +4     
  Branches     1084     1084           
=======================================
+ Hits        21858    21862    +4     
  Misses       1430     1430           
  Partials       34       34           

Flag	Coverage Δ
c-tests	91.88% <100.00%> (+<0.01%)	⬆️
lwt-tests	93.49% <ø> (ø)
python-c-tests	95.48% <ø> (ø)
python-tests	98.80% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
c/tskit/core.c	97.23% <100.00%> (+0.02%)	⬆️

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[jeromekelleher]

Note to self - typo in comments for tsk_calloc

[benjeffery]

LGTM, ready to merge?