Added `bytes32` as target type for `decimal` conversion

[jakerockland]

What I did

Added support for conversion to bytes32 from decimal. Minor part of #1093

How I did it

Minor change to convert.py.

How to verify it

Run the tests:

make test

Or more specifically:

pytest -k test_convert_to_bytes32

Description for the changelog

Added support for conversion to bytes32 from decimal.

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[fubuloubu]

Definitely need some comments here and similar other lines in this test to describe why certain bit patters are set.

Will docs be added to describe what the conversion will look like?

[jakerockland]

@fubuloubu great point, I'll add some comments noting the decimal precision and why these tests are like this + also will add more tests

I'll also add to the VIP at #1093 and to PR #1501 to describe in a bit more detail what this specific conversion looks like, as the decimal precision part is a bit unintuitive 😅

Will take care of this tonight 👍

[fubuloubu]

You the man!

[jakerockland]

@fubuloubu updated! 😄

[jakerockland]

Just updated the VIP #1093 and pending docs PR #1501 with additional clarification as well @fubuloubu 😄

[davesque]

Can we rename this method to something more meaningful like convert_literal_zero? Let's also do that for the storage variables and other methods. I think it will make it a bit easier for future readers to follow.

[jakerockland]

Sure thing @davesque will take care of this and the suggested refactoring below this evening.

[davesque]

The assertions about the lengths of fooVal and foobarVal as well as the equality check between fooVal and foobarVal aren't needed if the two assertions comparing those values to b"\x00" * 32 are satisfied.

[jakerockland]

@davesque good point, these is a bit of left-over bad testing from the original PR before I updated the tests—I'll clean this up 👍

[davesque]

Maybe we should factor out these repeated .to_bytes(...) operations into a helper function at the top of this testing module. Also, you can import DECIMAL_DIVISOR from vyper.utils.

[davesque]

Thanks for the work, @jakerockland !

[jakerockland]

@davesque just pushed a commit that incorporates all of your suggested changes above, may be worth making a code quality ticket to address auditing test methods across the testing suite and renaming needed functions to be more meaningful/readable, as the foobar thing is definitely present in other tests 😅I've written some of those foos but definitely not all of them 😛

[davesque]

@jakerockland Nice, thanks for the heads up. I wasn't aware of that.

[davesque]

LGTM. @fubuloubu Think this is ready to merge?

[jakerockland]

@davesque sure thing! Definitely would be a nice improvement in code-quality, but catching it new additions to the codebase like here is a good first step 😅