This includes a new function cty.ParseNumberVal which centralizes the
standard way to produce a cty.Number from a string so we can be sure to
always get comparable numbers.
* Add tests to cover new behavior introduced in cty
Convert should now not convert null to DynamicPseudoType, and Equals
will always compare Nulls as equal.
* update go.mod
However, since this repository is only a temporary home for this module,
the go.mod file carries a warning to that effect. It will move to its more
permanent home as it transitions from experimental to released.
