Commits on Apr 15, 2022

1. lang/funcs: type conversion functions can convert null values …

   We had intended these functions to attempt to convert any given value, but
   there is a special behavior in the function system where functions must
   opt in to being able to handle dynamically-typed arguments so that we
   don't need to repeat the special case for that inside every function
   implementation.
   
   In this case we _do_ want to specially handle dynamically-typed values,
   because the keyword "null" in HCL produces
   cty.NullVal(cty.DynamicPseudoType) and we want the conversion function
   to convert it to a null of a more specific type.
   
   These conversion functions are already just a thin wrapper around the
   underlying type conversion functionality anyway, and that already supports
   converting dynamic-typed values in the expected way, so we can just opt
   in to allowing dynamically-typed values and let the conversion
   functionality do the expected work.
   
   Fixing this allows module authors to use type conversion functions to
   give additional type information to Terraform in situations that are too
   ambiguous to be handled automatically by the type inference/unification
   process. Previously tostring(null) was effectively a no-op, totally
   ignoring the author's request to treat the null as a string.

   

   apparentlymart committed Apr 15, 2022
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