use util.tinsert instead of table.insert
Merge pull request #51 from mpeterv/fixing_#50

use util.tinsert instead of table.insert
Remove unnecessary test from util.deepcompare

The immediately preceding test has made sure that `ty1` and `ty2` are the
same.

As a result, if `ty1 ~= 'table'`, there's no need to test `ty2`.
Merge pull request #52 from telemachus/tweak-deepcompare

Remove unnecessary test from util.deepcompare
Added multiplatform CI testing
Merge pull request #53 from mpeterv/multiplatform_testing

Added multiplatform CI testing
Change scope of valfmt to local
Merge pull request #55 from bullno1/patch-1

Change scope of valfmt to local