Support integer schema versions through typed decoding

load.go

@@ -51,12 +51,14 @@ type Resolution struct {
 }
 
 // VersionRule declares the input path and application checker for a schema version.
+// At that path, string and decimal-integer input is supplied as Version.Text.
 type VersionRule struct {
 	Path  Path
 	Check func(Version, *Validation) error
 }
 
-// Version preserves the absent, null, and string states of a schema-version input.
+// Version preserves the absent, null, and textual states of a schema-version input.
+// Text is the exact spelling of accepted string or decimal-integer input.
 type Version struct {
 	Present bool
 	Null    bool