This is the mirror image of #2170.

### Checklists

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- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry
- [x] Add / update tests
- [x] Add new / update outdated documentation

Add `default_converter` argument to `to_js` and `toJs`. This is the mirror image of #2170.

### Checklists

<!-- Note on checklists:
     If you think some of these steps are not necessary for your PR,
     just remove those checkboxes, or mark them as checked. Otherwise,
     if some checkboxes are left unmarked, we might assume that your PR
     is not ready to be merged and we might keep you waiting -->

- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry
- [x] Add / update tests
- [x] Add new / update outdated documentation

package:
  name: swiglpk
  version: 5.0.3

source:
  sha256: 32f9fa0a082d80e32234f060704b6d7f07843a7aefffa5008b315b0970bab199
  url: https://github.com/biosustain/swiglpk/archive/refs/tags/5.0.3.tar.gz
  extras:
    - [../glpk/build/glpk-5.0/src/glpk.h, ./glpk.h]
  patches:
    - patches/respect-skip-build-flag.patch

build:
  ldflags: -L$(PYODIDE_ROOT)/packages/glpk/build/glpk-5.0/src/.libs/

requirements:
  run:
    - glpk

test:
  imports:
    - swiglpk

package:
  name: swiglpk
  version: 5.0.3

source:
  sha256: 32f9fa0a082d80e32234f060704b6d7f07843a7aefffa5008b315b0970bab199
  url: https://github.com/biosustain/swiglpk/archive/refs/tags/5.0.3.tar.gz
  extras:
    - [../glpk/build/glpk-5.0/src/glpk.h, ./glpk.h]
  patches:
    - patches/respect-skip-build-flag.patch

build:
  ldflags: -L$(PYODIDE_ROOT)/packages/glpk/build/glpk-5.0/src/.libs/

requirements:
  run:
    - glpk

test:
  imports:
    - swiglpk
