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# An array type for user options
Previously to have an option that took more than one value a string value would
have to be created and split, but validating this was difficult. A new array type
has been added to the meson_options.txt for this case. It works like a 'combo', but
allows more than one option to be passed. The values can optionally be validated
against a list of valid values. When used on the command line (with -D), values
are passed as a comma separated list.
```meson
option('array_opt', type : 'array', choices : ['one', 'two', 'three'], value : ['one'])
```
These can be overwritten on the command line,
```meson
meson _build -Darray_opt=two,three
```
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