fix(merge-styles): keep same type output for DeepPartialV2 to match original DeepPartial

[Hotell]

Previous Behavior

New Behavior

Related Issue(s)

• Follows fix(merge-styles): introduce DeepPartialV2 type to avoid infinite type instantiation and make unions declaration more performant #31703
• Fixes [Bug]: The latest version of @fluentui/merge-styles package is breaking. #31769

[fabricteam]

📊 Bundle size report

✅ No changes found

[fabricteam]

🕵 fluentuiv8 No visual regressions between this PR and main

[fabricteam]

Perf Analysis (@fluentui/react)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
BaseButton	mount	627	638	5000
Breadcrumb	mount	1691	1688	1000
Checkbox	mount	1716	1744	5000
CheckboxBase	mount	1493	1491	5000
ChoiceGroup	mount	2988	2978	5000
ComboBox	mount	684	688	1000
CommandBar	mount	6537	6511	1000
ContextualMenu	mount	12897	12832	1000
DefaultButton	mount	818	788	5000
DetailsRow	mount	2227	2292	5000
DetailsRowFast	mount	2237	2218	5000
DetailsRowNoStyles	mount	2071	2030	5000
Dialog	mount	2706	2776	1000
DocumentCardTitle	mount	241	227	1000
Dropdown	mount	2007	2037	5000
FocusTrapZone	mount	1133	1148	5000
FocusZone	mount	1107	1092	5000
GroupedList	mount	41990	42436	2
GroupedList	virtual-rerender	18078	20212	2
GroupedList	virtual-rerender-with-unmount	51296	51541	2
GroupedListV2	mount	233	228	2
GroupedListV2	virtual-rerender	204	213	2
GroupedListV2	virtual-rerender-with-unmount	240	234	2
IconButton	mount	1122	1160	5000
Label	mount	355	342	5000
Layer	mount	2730	2750	5000
Link	mount	406	409	5000
MenuButton	mount	985	1022	5000
MessageBar	mount	21263	21265	5000
Nav	mount	2106	2032	1000
OverflowSet	mount	808	818	5000
Panel	mount	1815	1863	1000
Persona	mount	750	745	1000
Pivot	mount	928	913	1000
PrimaryButton	mount	940	931	5000
Rating	mount	4750	4677	5000
SearchBox	mount	917	927	5000
Shimmer	mount	1913	1882	5000
Slider	mount	1353	1297	5000
SpinButton	mount	3065	3001	5000
Spinner	mount	398	402	5000
SplitButton	mount	1871	1874	5000
Stack	mount	420	420	5000
StackWithIntrinsicChildren	mount	892	888	5000
StackWithTextChildren	mount	2801	2781	5000
SwatchColorPicker	mount	6462	6437	5000
TagPicker	mount	1440	1461	5000
Text	mount	387	386	5000
TextField	mount	939	948	5000
ThemeProvider	mount	870	870	5000
ThemeProvider	virtual-rerender	603	578	5000
ThemeProvider	virtual-rerender-with-unmount	1330	1341	5000
Toggle	mount	617	617	5000
buttonNative	mount	200	203	5000