Thankfully this was a lot easier than tracing hiwire keys. 

I located one actual leak: if an error is thrown during `to_js` it would forget to free `proxies`. Other than that, I fixed a few "dumb leaks" in `api.js` where we leak the methods like `eval_code` or `find_imports`. So the code was already in surprisingly good shape in this way.

It's still possible that we leak some Python objects somehow, but this is as good as we can do for systematic checks short of compiling Python itself with `TRACE_MALLOC`.
Eliminate pyproxy leaks. Thankfully this was a lot easier than tracing hiwire keys. 

I located one actual leak: if an error is thrown during `to_js` it would forget to free `proxies`. Other than that, I fixed a few "dumb leaks" in `api.js` where we leak the methods like `eval_code` or `find_imports`. So the code was already in surprisingly good shape in this way.

It's still possible that we leak some Python objects somehow, but this is as good as we can do for systematic checks short of compiling Python itself with `TRACE_MALLOC`.
# Pyodide packages

This folder contains the list of packages built in pyodide.

There are two categories of packages,
 1. Those that contain a `meta.yaml` are built with the Python build system
    using `pyodide_build/buildall.py` and `pyodide_build/buildpkg.py` scripts.
 2. Those that contain a `Makefile` are build from the main `Makefile` in the
    root folder.

Packages of the second category will be migrated to use a `meta.yaml` in the
future (see [#713](https://github.com/pyodide/pyodide/issues/713)).

# Pyodide packages

This folder contains the list of packages built in pyodide.

There are two categories of packages,
 1. Those that contain a `meta.yaml` are built with the Python build system
    using `pyodide_build/buildall.py` and `pyodide_build/buildpkg.py` scripts.
 2. Those that contain a `Makefile` are build from the main `Makefile` in the
    root folder.

Packages of the second category will be migrated to use a `meta.yaml` in the
future (see [#713](https://github.com/pyodide/pyodide/issues/713)).
