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When arrays were added they were called arrays. Because the are
implemented with Python lists, that language started leaking into
talking about Meson types. This is confusing. I've attempted, as much as
possible, to move to using one name, array. I picked array because 1)
It's the original name used, and 2) what Meson has are more properly
arrays as they have a fixed length, while a critical property of lists
are the ability to link and unlink them.
There are a couple of places where the list language has leaked into the
names of keyword arguments. I have not made any attempt to change those,
I don't know if it's that useful or not.
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This allows users to do two things, flatten potentially nested arrays
themselves, and, to safely convert types that may be an array to not an
array.
```meson
x = [meson.get_external_property('may_be_array)].flatten()
```
```meson
x = ['a', ['b', 'c']]
assert(x.flatten() == ['a', 'b', 'c'])
```
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