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The failed key is available as exc.args[0], as per CPython.

Iterables don't respond to __len__, so call __len__ on the original
argument.

Accepts only value of True.

This includes making sure that utime_mphal's sleep_ms() and sleep_us()
don't sleep on negative arguments.

As long as a port implement mp_hal_sleep_ms(), mp_hal_ticks_ms(), etc.
functions, it can just use standard implementations of utime.sleel_ms(),
utime.ticks_ms(), etc. Python-level functions.

Now there is just one function to allocate a new vstr, namely vstr_new
(in addition to vstr_init etc).  The caller of this function should know
what initial size to allocate for the buffer, or at least have some policy
or config option, instead of leaving it to a default (as it was before).

And it gives problems with header dependencies for auto-qstr generation.

The qemu-arm port is used for testing of ARM Thumb architecture on a
desktop so should have many features enabled.

This refactors ujson.loads(s) to behave as ujson.load(StringIO(s)).

Increase in code size is: 366 bytes for unix x86-64, 180 bytes for
stmhal, 84 bytes for esp8266.

The boot issue text mentions a help() function and encourages
the user to run it. It is very disconcerting to find that the
function does not exist...
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

Initial support for running on a baremetal, low-heap systems (like esp8266),
using Python module interface.

"Forced exit" is treated as soft-reboot (Ctrl+D). But expected effect of
calling sys.exit() is termination of the current script, not any further
and more serious actions like mentioned soft reboot.

Setting emit_dent=0 is unnecessary because arriving in that part of the
if-logic will guarantee that emit_dent is already zero.

The block to check indent_top(lex)>0 is unreachable because a newline is
always inserted an the end of the input stream, and hence dedents are
always processed before EOF.

It was a relic from the days of developing the compiler and is no longer
needed, and it's impossible to trigger via a test.

As per discussion in #2449, using write requests instead of read requests
for I2C.scan() seems to support a larger number of devices, especially
ones that are write-only.  Even a read-only I2C device has to implement
writes in order to be able to receive the address of the register to read.

It contains detailed information about writing scripts to run efficiently
on microcontrollers (and other constrained systems).

Adds check that LZ offsets fall into the sliding dictionary used. This
catches a case when uzlib.DecompIO with a smaller dictionary is used
to decompress data which was compressed with a larger dictionary.
Previously, this would lead to producing invalid data or crash, now
an exception will be thrown.