I'm writing some simple code, and I believe I'm running into trouble
getting a primitive char.

user=> (def s (new StringBuilder "aaa"))
#'user/s

; Java method signature is setCharAt(int index, char ch)
user=> (. s setCharAt (int 0) (char \a))

java.lang.IllegalArgumentException: No matching method found:
setCharAt for class java.lang.StringBuilder (NO_SOURCE_FILE:0)
user=> (type (char \a))
java.lang.Character
; should be char?
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