This brings in the new HCL extension functions "try", "can", and
"convert", along with the underlying HCL and cty infrastructure that allow
them to work.
This includes:
- An additional check in the format stdlib function to fail if there are
too many arguments given, rather than silently ignoring.
- Refinements for the type unification behavior to allow unification of
object/tuple types into weaker map/list types when no other unification
is possible.
- Improvements to the error messages for failed type conversions on
collection and structural types to talk about mismatching element types
where possible, rather than the outer value.
This is largely minor bugfixes for issues found since we last updated the
vendoring. There are some new features here that Terraform is not yet
using and thus present little risk.
In particular this includes the HCL-JSON spec change where arrays can now
be used at any level in a block label structure, to allow for preserving
the relative order of blocks.
This new version supports a conversion from object types to map types,
which is important for Terraform because HCL2 { ... } syntax produces
objects but lots of Terraform attributes require maps.
Martin Atkins