Contract| Parameter key | Default value | Type | | on | req | string | | new_path | opt | string | | message | "" | string | | title | opt | | significance | 0 | type.<range_of min=0.0 max=10.0 include_max=true number_type=number/> | | old_still_works | false | boolean | | changed_on | opt | datetime | | why | opt | string | | developer | opt | string | | internal_note | opt | string | | error_prefix | ' Change req ' | string | | id | opt | | backward_compatibility_code | opt | | Water Contract<class change.removed
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