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This patch checks that there is only one *, and that ** is last in the
arg list.

Fixes issue #1623.

Loading .mpy files will now check to make sure that the target VM can
support the bytecode.

Tested by comparability to small int/casting to bool.

And thus can be successfully used in comparisons, etc.

%f prints true integer digit, so its calculation should happen before any
exponential scaling.

This takes previous IEEE-754 single precision float implementation, and
converts it to fully portable parametrizable implementation using C99
functions like signbit(), isnan(), isinf(). As long as those functions
are available (they can be defined in adhoc manner of course), and
compiler can perform standard arithmetic and comparison operations on a
float type, this implementation will work with any underlying float type
(including types whose mantissa is larger than available intergral integer
type).

In other words, unix port now uses overriden printf(), instead of using
libc's. This should remove almost all dependency on libc stdio (which
is bloated).

This may not seem like the ideal place, but is actually the only place
in py/ where it gets referenced, so is just right.

Return tuple of (address_family, net_addr, [port, [extra_data]]). net_addr
is still raw network address as bytes object, but suitable for passing to
inet_ntop() function. At the very least, sockaddr() will separate address
family value from binary socket address (and currently, only AF_INET family
is decoded).

Here we are assuming that a thumb2 port will have fatfs, which is only
roughly true.  We need a better way of enabling specific raw-code file
readers.

This can then be passed to mp_raw_code_save_file to save a .mpy file.

This change makes the code behave how it was supposed to work when first
written.  The avail_slot variable is set to the first free slot when
looking for a key (which would come from deleting an entry).  So it's
more efficient (for subsequent lookups) to insert a new key into such a
slot, rather than the very last slot that was searched.

Also provide workarounds, link to other revelant sections,
and fix some typos.

- The link establishment timeout is infinite by default
- Fix typo in notes about the auth kwarg

It can change asynchronously.

Will be included only when MICROPY_PY_MATH_SPECIAL_FUNCTIONS is enabled.

Also covers cmath module (but only log10 is there at the moment).