Correct the Data and RichData membership lists

RichData omitted several types that it matches but Data does not: URI,
regular expressions, and resource and class references.

Correcting that exposed two errors in the existing Data section. Data was
described as matching any value that would match Scalar, but it is built
on ScalarData, so a regular expression matches Scalar and not Data. Its
hashes were described as taking keys that match Scalar, but only string
keys are accepted at runtime; integer, float, and boolean keys are all
rejected.

Verified against OpenVox 8.28.1 by sweeping every candidate type for
RichData and Data membership.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Michael Harp <mike@mikeharp.com>

Author: miharp

docs/_openvox_8x/lang_data_abstract.md

@@ -13,6 +13,7 @@ title: "Language: Data types: Abstract data types"
 [hash_missing_key_access]: ./lang_data_hash.html#accessing-values
 [numbers]: ./lang_data_number.html
 [semver]: ./lang_data_semver.html
+[uri]: ./lang_data_uri.html
 [time]: ./lang_data_time.html
 [binary]: ./lang_data_binary.html
 [error]: ./lang_data_error.html
@@ -287,13 +288,15 @@ It takes no parameters.
 
 ### `Data`
 
-The `Data` data type matches any value that would match `Scalar`, but it also matches:
+The `Data` data type matches any value that would match `ScalarData`, but it also matches:
 
 * `undef`
 * [Arrays][] that only contain values that would also match `Data`
-* [Hashes][] whose keys would match `Scalar` and whose values would also match `Data`
+* [Hashes][] whose keys are [strings][] and whose values would also match `Data`
 
-Note that it doesn't match `default` or resource references.
+Note that it is built on `ScalarData` rather than `Scalar`, so the members of `Scalar` that have no JSON
+equivalent are excluded: a regular expression matches `Scalar` but not `Data`. It also doesn't match
+`default` or resource references.
 
 It takes no parameters.
 
@@ -304,12 +307,15 @@ It takes no parameters.
 The `RichData` data type matches any value that would match `Data`, and also matches the types that have no
 direct JSON equivalent:
 
+* [Regular expressions][]
+* [`URI`][uri]
 * [`Binary`][binary]
 * [`Timestamp` and `Timespan`][time]
 * [`SemVer` and `SemVerRange`][semver]
 * [`Error`][error]
 * [`Sensitive`][sensitive]
 * Data types themselves, such as `Integer`
+* Resource and class references
 * `default`
 * [Arrays][] and [hashes][] containing any of the above