Introduces `CallHooks` to enable extensions to the type inference and
AST finalization process. This allows for more dynamic and configurable
behavior without hardcoding symbol names in the compiler core.
Specifically, this commit adds:
- **`series_post_call`**: A hook for the `(series n)` function. It
ensures that the return type is a fresh `TypeVar` when the element
type is `Any`, allowing for proper type inference from subsequent
`push` calls.
- **`series_finalize`**: A hook for `(series n)` that rewrites the AST
node. It replaces the generic `series` call with a pre-configured
factory closure that allocates the correct series storage type (e.g.,
`ScalarSeries<f64>` for floats, `RecordSeries` for records). This
avoids runtime dispatch and relies on type information captured during
compilation.
- **`push_post_call`**: A hook for the `(push series val)` function. It
unifies the series element `TypeVar` with the pushed value's type. It
also handles numeric and record field promotion and updates the
`TypeVar` binding if a promotion occurs.
Brummel
8efd12add6