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micropython.stack_use() returns an integer being the number of bytes used
on the stack.

micropython.heap_lock() and heap_unlock() can be used to prevent the
memory manager from allocating anything on the heap.  Calls to these are
allowed to be nested.

This allows FROZEN_DIR=some-directory to be specified on the make
command line, which will then add all of the files contained within
the indicated frozen directory as frozen files in the image.

There is no change in flash/ram usage if not using the feature.

This is especially useful on smaller MCUs (like the 401) which only
has 64K flash file system.

By reserving enough space for peer address.

Implement enough of statvfs to determine the amount of free
space on a volume.

This allows to cut number of packages installed from 3rd-party package repos,
and otherwise cut number of overrides and hacks.

Seedable and reproducible pseudo-random number generator. Implemented
functions are getrandbits(n) (n <= 32) and seed().

The algorithm used is Yasmarang by Ilya Levin:
http://www.literatecode.com/yasmarang

This will help make sure new commits work with OBJ_REPR_D.

Build using: make nanbox

this allows python code to use property(lambda:..., doc=...) idiom.

named versions for the fget, fset and fdel arguments are left out in the
interest of saving space; they are rarely used and easy to enable when
actually needed.

a test case is included.

This is essentially a duplicate of obj_dict.py

Makes code easier to read and more maintainable.

The first argument to the type.make_new method is naturally a uPy type,
and all uses of this argument cast it directly to a pointer to a type
structure.  So it makes sense to just have it a pointer to a type from
the very beginning (and a const pointer at that).  This patch makes
such a change, and removes all unnecessary casting to/from mp_obj_t.

With this patch the n_args parameter is changed type from mp_uint_t to
size_t.

This patch changes the type signature of .make_new and .call object method
slots to use size_t for n_args and n_kw (was mp_uint_t.  Makes code more
efficient when mp_uint_t is larger than a machine word.  Doesn't affect
ports when size_t and mp_uint_t have the same size.

Instead of struct tm like structure, as required by CPython.

Replace hyphens with undescores in modules.

This allows a port to specify exactly how many bits are in a small
int (eg for a uPy bytecode cross compiler).

In some cases ssize_t is not defined by already included headers.

Need to record in .mpy file whether unicode is enabled, and how many bits
are in a small int.