NAME
Catmandu::Fix::set_field - add or change the value of a HASH key or ARRAY index
DESCRIPTION
Contrary to add_field, this will not create the intermediate structures if they are missing.
SYNOPSIS
# Change the value of 'foo' to 'bar 123'
set_field('foo','bar 123');
# Change a deeply nested key
set_field('my.deep.nested.key','hi');