when switching from hamcrest to assertj i ran into...

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[tipsy]

when switching from hamcrest to assertj i ran into a trouble with instanceOf:

assertThat(validate("true").asBoolean().getOrThrow(), `is`(instanceOf(Boolean::class.java))) // old - hamcrest
assertThat(validate("true").asBoolean().getOrThrow()).isInstanceOf(Boolean::class.java) // new - assertj

outputs:

Expecting:
  <true>
to be an instance of:
  <boolean>
but was instance of:
  <java.lang.Boolean>

does anyone know why?