Dev: remove _parent_name in BaseBuilder::objectToArray()

[kenjis]

I would like to remove _parent_name in BaseBuilder::objectToArray().

CodeIgniter4/system/Database/BaseBuilder.php

Lines 2708 to 2709 in 071cd04

	// There are some built in keys we need to ignore for this conversion
	if (! is_object($val) && ! is_array($val) && $key !== '_parent_name') {

Because it seems there is no place to use '_parent_name' in the code base.

[MGatner]

I'm not even sure what this does 😅

[kenjis]

I don't know either.

[iRedds]

It came from ci2 (I didn't find the 1.x version). Perhaps this is an internal solution from EllisLab.

[MGatner]

Wow. That's some legacy!

Burn it with 🔥