BUG: fillna with DataFrame input should preserve dtype when possible #24107

Job	Run time
Linux-32-bit	18m 27s
Linux-Musl	15m 30s
python-dev	0s
Pyodide build	23m 20s
macos-13 actions-310.yaml	30m 36s
macos-13 actions-312.yaml	39m 21s
macos-13 actions-311.yaml	40m 9s
macos-14 actions-311.yaml	21m 8s
macos-14 actions-313.yaml	20m 26s
macos-13 actions-313.yaml	30m 36s
macos-14 actions-310.yaml	28m 58s
windows-latest actions-310.yaml	44m 48s
windows-latest actions-312.yaml	39m 21s
windows-latest actions-311.yaml	36m 58s
macos-14 actions-312.yaml	21m 17s
Pypy	1m 34s
ubuntu-24.04-arm actions-310.yaml	36m 13s
windows-latest actions-313.yaml	45m 48s
ubuntu-24.04 actions-311.yaml	42m 14s
Freethreading	21m 14s
ubuntu-24.04 actions-310.yaml	47m 42s
ubuntu-24.04 actions-312.yaml	43m 54s
Numpy Dev	16m 53s
Downstream Compat	6m 18s
Locale: it_IT	24m 29s
Minimum Versions	23m 56s
Locale: zh_CN	24m 27s
Future infer strings (without pyarrow)	39m 29s
Future infer strings	45m 51s
ubuntu-24.04-arm actions-312.yaml	35m 42s
ubuntu-24.04-arm actions-311.yaml	34m 57s
ubuntu-24.04-arm actions-313.yaml	35m 9s
Pyarrow Nightly	20m 23s
ubuntu-24.04 actions-313.yaml	48m 41s
	16h 45m 49s

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