Z3报告＆＃34;未知＆＃34;对于一些涉及（_ as-array ...）的公式

Question

Z3（版本4.4.1）报告＆＃34;未知＆＃34;对于我编写的工具生成的许多查询，我已将问题缩小到使用(_ as-array ...)：

(declare-sort MyType)
(declare-fun f (MyType) Bool)
(declare-const a1 (Array MyType Bool))
(declare-const a2 (Array MyType Bool))

; This works fine! (output is SAT)
(push)
(assert (distinct a1 a2))
(check-sat)
(pop)

; This does not! (output is UNKNOWN)
(push)
(assert (distinct a1 (_ as-array f)))
(check-sat)
(pop)

我是否陷入了一个已知不可判断的案件（或在Z3中未实施）？