Yes, mostly. reader macros are not extensible by the user. The compiler has and uses reader macros. Rich Hickey has said he hasn't seen an implementation of re

Yes, mostly. reader macros are not extensible by the user. The compiler has and uses reader macros. Rich Hickey has said he hasn't seen an implementation of reader macros that is compose-able across libraries. i.e. two different OSS libs using a two different incompatible macros.