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doc: errno is a number, not a string #9007

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doc: errno is a number, not a string #9007

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8 changes: 5 additions & 3 deletions doc/api/errors.md
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Expand Up @@ -449,13 +449,15 @@ added properties.
### Class: System Error

#### error.code
#### error.errno

Returns a string representing the error code, which is always `E` followed by
a sequence of capital letters, and may be referenced in `man 2 intro`.

The properties `error.code` and `error.errno` are aliases of one another and
return the same value.
#### error.errno

Returns a number corresponding to the **negated** error code, which may be
referenced in `man 2 intro`. For example, an `ENOENT` error has an `errno` of
`-2` because the error code for `ENOENT` is `2`.

#### error.syscall

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