Macro match_each_dscalar_pair 

macro_rules! match_each_dscalar_pair {
    (($left:expr, $right:expr), | $l:ident, $r:ident | $body:block, $else:block) => { ... };
}

Matches on pairs of DecimalScalar with the same type and executes the provided code.

This macro matches two decimal scalars when they have the same underlying type. For type mismatches, the $else block is executed.