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Ran 05 Apr 2019 08:08PM UTC

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Committed 05 Apr 2019 08:07PM UTC coverage: 97.539% (-1.0%) from 98.588%

Job # LUA="lua=5.2"

Build Type

Pull #45

travis-ci

Committed by

web-flow

Commit Message

add a special case for NULL userdata

When interpreting userdata values using 'inspect', the numeric identifiers
are useful to match identify of pointers (comparing the low counters
like `<userdata 3> is easier than reading long pointers like
`userdata: 0x749abc39efa29`).

However, the `NULL` pointer is enough of a special case that it is
important to know when one of those numbered pointers happens to
be `NULL`. When one is dealing with things like JSON parsers, where
the only usual userdata is `cjson.null`, one gets accostumed over
time to interpret `<userdata 1>` to mean `NULL`. This is not obvious,
however, and a seasoned user will trip up the day another userdata
is used in the same table and `NULL` is now `<userdata 2>`.

Adding a test for this would require compiling and loading a C extension.

Pull Request Pull Request #45: Improve output of userdata, handling`__tostring` and NULL

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