Combine f.write(pack( "<d"etc., )) calls #98

Job	Run time
test_on_EOL_Pythons (3.5)	45s
test_on_EOL_Pythons (3.6)	49s
test_on_EOL_Pythons (3.8)	47s
pre-commit	11s
pylint	19s
test_on_EOL_Pythons (3.7)	47s
test_on_EOL_Pythons (2.7)	47s
test_on_supported_Pythons (3.9, macos-latest)	57s
test_on_supported_Pythons (3.9, ubuntu-24.04)	30s
test_on_supported_Pythons (3.9, windows-latest)	44s
test_on_supported_Pythons (3.10, ubuntu-24.04)	36s
test_on_supported_Pythons (3.10, macos-latest)	40s
test_on_supported_Pythons (3.11, macos-latest)	28s
test_on_supported_Pythons (3.11, windows-latest)	53s
test_on_supported_Pythons (3.10, windows-latest)	48s
test_on_supported_Pythons (3.11, ubuntu-24.04)	29s
test_on_supported_Pythons (3.12, ubuntu-24.04)	41s
test_on_supported_Pythons (3.14.0-beta.4, windows-latest)	1m 55s
test_on_supported_Pythons (3.14.0-beta.4, macos-latest)	51s
test_on_supported_Pythons (3.14.0-beta.4, ubuntu-24.04)	39s
test_on_supported_Pythons (3.12, windows-latest)	57s
test_on_supported_Pythons (3.13, ubuntu-24.04)	42s
test_on_supported_Pythons (3.13, macos-latest)	38s
test_on_supported_Pythons (3.13, windows-latest)	45s
test_on_supported_Pythons (3.12, macos-latest)	26s
	18m 4s

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