I'm puzzled by two :or syntaxes that are used in io.pedestal.service.http,
from [io.pedestal/pedestal.service "0.1.1-SNAPSHOT"], which is where
following along with the Getting Started got me.
In one place, it pairs :or with a map whose keys are symbols being bound in
the outer form:
{routes ::routes
file-path ::file-path
resource-path ::resource-path
method-param-name ::method-param-name
:or {file-path nil
resource-path "public"
method-param-name :_method}
:as service-map}
A little farther down, it pairs :or with a map whose key is a key from the
map being destructured:
{servlet ::servlet
type ::type
:or {::type :jetty}
:as service-map}
In a tiny experiment, I don't see the second way working. But the compiler
does not emit any message. Is there something subtle going on?
helloworld.server=> (defn a [{x :X y :Y :or {y 3}}] (vector x y))
#'helloworld.server/a
helloworld.server=> (a {:X 7})
[7 3]
helloworld.server=> (defn a' [{x :X y :Y :or {:Y 3}}] (vector x y))
#'helloworld.server/a'
helloworld.server=> (a' {:X 7})
[7 nil]
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