Given a protocol Var pvar, its method method-var and instrument-method,
instrument the protocol method.

Replicate pre/postcondition logic from clojure.core/fn.

Like assert, but throws a RuntimeException (in Clojure) and takes args to format.

Take the &env from a macro, and tell whether we are expanding into cljs.

Returns true if validation should be included at compile time, otherwise false.
Validation is elided for any of the following cases:
*   function has :never-validate metadata
*   *compile-fn-validation* is false
*   *assert* is false AND function is not :always-validate

Like defrecord for schema primitives, and also registers cross-platform print methods.

Generate a cross-platform exception appropriate to the macroexpansion context

Take a nonempty seq, which may start like [a ...] or [a :- schema ...], and return
a list of [first-element-with-schema-attached rest-elements]

Pull out the schema stored on a thing.  Public only because of its use in a public macro.

Return then if we are generating cljs code and else for Clojure code.
https://groups.google.com/d/msg/clojurescript/iBY5HaQda4A/w1lAQi9_AwsJ

Helper for defining defn-like macros with schemas.  Env is &env
from the macro body.  Reads optional docstring, return type and
attribute-map and normalizes them into the metadata of the name,
returning the normalized arglist.  Based on
clojure.tools.macro/name-with-attributes.

Take an object with optional metadata, which may include a :tag,
plus an optional explicit schema, and normalize the
object to have a valid Clojure :tag plus a :schema field.

Helper for schema.core/=>*.

Take an arg vector, in which each argument is followed by an optional :- schema,
and transform into an ordinary arg vector where the schemas are metadata on the args.

Process the fn args into a final tag proposal, schema form, schema bindings, and fn form

Process a single (bind & body) form, producing an output tag, schema-form,
 and arity-form which has asserts for validation purposes added that are
 executed when turned on, and have very low overhead otherwise.
 tag? is a prospective tag for the fn symbol based on the output schema.
 schema-bindings are bindings to lift eval outwards, so we don't build the schema
 every time we do the validation.

:ufv-sym should name a local binding bound to `schema.utils/use-fn-validation`.

5-args arity is deprecated.

Given a Symbol, attempt to return a valid Clojure tag else nil.

Symbols not contained in `primitive-sym?` will be resolved. Symbols
resolved to Vars have their values checked in an attempt to provide
type hints when possible.

A valid tag is a primitive, Class, or Var containing a Class.

Like get but throw an exception if not found. A macro for historical reasons (to
work around cljx function placement restrictions).

Globally turn on or off function validation from being compiled into s/fn and s/defn.
Enabled by default.
See (doc compile-fn-validation?) for all conditions which control fn validation compilation

A cross-platform variant of try-catch that catches all* exceptions.
Does not (yet) support finally, and does not need or want an exception class.

*On the JVM certain fatal exceptions are not caught.