== default new files don't have project
0
== set new project on files and dirs
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== non-root can see id
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== can use IDs around long width limits
2147483647
2147483648
4294967295
9223372036854775807
9223372036854775808
18446744073709551615
== created files and dirs inherit project id
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== inheritance continues
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== clearing project id stops inheritance
0
0
== o_tmpfile creations inherit dir
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