Details
Description
ValueSet.compose.include.filter.value is of string types, but filters (and properties that can be used as filters) can be of code, Coding, string, integer, boolean, dateTime, or decimal datatypes.
The short description of value suggests boolean is only supported for "exists", and ignores several of the other types. The definition is extremely hard to understand, and should just be rewritten more clearly. We also need to emphasize that, regardless of what the type of the property is, the value must be expressed as a string.
Also, add decimal to type details in the table in https://build.fhir.org/codesystem.html#properties.