Also adds automatic conversion of int -> float when the ":f"
format code is specified.

Fixes a f-string formatting style regression introduced in #1625.

Add support for string formatting of floats with ":f" format code

because the previous naming gives unclear performance estimation to
users especially comparing to objstr::borrow_value

bump up num-bigint to 0.2.4 to fix modpow

- Expose `pyEval`, `pyExec`, `pyExecSingle` in wasm module

Support eval and exec mode in wasm

Contributes to #1656

Add support for the `%` format code for floats.

Run unittests

Add missing assert in stdlib_os snippet

Lib/test/test_copy.py from CPython v3.8.1

Lib/test/test_types.py from CPython v3.8.1

Fix int.from_bytes type

Ugrade dependencies and update lockfile format

Fix bytecode::CallType::Ex to raise non-str type error

Support timeout in Popen.communicate

Cache Cargo dependencies in Github Actions

github actions run pytest with -v option

Deploy the demo using Github Actions

parse_number can raise error about length

PyBaseObject

Fix type() error message and BaseException.__str__