fix #3439 issue with useWatch default value

[bluebill1049]

• improve getPath perf
• fix useWatch not updating quite properly if defaultValue is set #3439
• close Feature Request: useWatch return latest form value instead of the default value #2739

[github-actions]

Size Change: -31 B (0%)

Total Size: 97.3 kB

Filename	Size	Change
dist/index.cjs.development.js	15.6 kB	-7 B (0%)
dist/index.cjs.production.min.js	9.12 kB	+7 B (0%)
dist/index.esm.js	15.7 kB	-5 B (0%)
dist/index.ie11.development.js	20.1 kB	-18 B (0%)
dist/index.ie11.production.min.js	11.4 kB	-2 B (0%)
dist/index.umd.development.js	15.9 kB	-8 B (0%)
dist/index.umd.production.min.js	9.21 kB	+2 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
dist/index.ie11.js	143 B	0 B
dist/index.js	142 B	0 B

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