Variable size/Set
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Demonstrate how to specify the minimum size of a variable or a data type.
Ada
type Response is (Yes, No); -- Definition of an enumeration type with two values for Response'Size use 1; -- Setting the size of Response to 1 bit, rather than the default single byte size
Perl
I suppose you could use vec() or similar to twiddle a single bit. The thing is, as soon as you store this in a variable, the SV (the underlying C implementation of the most simple data type) already takes a couple dozen of bytes.
In Perl, memory is readily and happily traded for expressiveness and ease of use.