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)
# If the second argument is omitted the field has a null value
add_field(foo)