default

Set the given defaultValue as the default for any missing members of data class T. Any time an object of type T is being decoded but the TOML document is missing one or more fields needed to construct the object, that value will be fetched from the default value.

While it is possible to set defaults for atomic types, it will not have any effect as atomic types have no fields.

As an example, if we try to decode a TOML document which only has the key x = 42 into the type data class Foo(val x: Int, val y: Int) with a default value of Foo(0, 0), the result will be Foo(42, 0), as the y field is filled in from the default value.