Selecting from float4[] arrays

Anyone know how I could select something from a table for all cases
where one or more value in an array of floats for that table equals a
specified value.

example,

select * from table_name where table_name.float_array = 2.5;

where float_array is defined as an array of floats (float4[]).

I know the line I used in the example won't work because '=' doesn't
work on arrays.

Thanks.
-Tony

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