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- Make TypeCreator and TreeCreator extend Serializable.
- When replacing a SerializedTypeTag with a TypeTag or WeakTypeTag,
do not use scala.reflect.runtime.universe.rootMirror, since
it is unlikely to find user classes; instead, create a runtime
mirror using the context ClassLoader of the current thread.
Use the same logic for SerializedExpr.
- Remove writeObject/readObject methods from SerializedTypeTag
and SerializedExpr since they are unused.
- Add @throws annotation on writeReplace and readResolve methods.
- Handle SecurityException if the current thread cannot access the
context ClassLoader.
- To make type tags of primitive value classes serializable, make
PredefTypeCreator a top-level class. Otherwise, it would
retain a reference to the enclosing Universe,
rendering the TypeCreator non-serializable.
Binary compatibility:
- Keep nested PredefTypeCreator class to avoid backward binary
incompatible change.
- Keep `var` modifiers on the class parameters of
SerializedTypeTag for backward binary compatibility.
- Adds filter rules to forward binary compatibility whitelist:
- `TypeCreator`, `PredefTypeCreator`, and `TreeCreator` must now
extend from `Serializable`.
- Must have new class `scala.reflect.api.PredefTypeCreator`
to avoid problematic outer reference.
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