$ for egg in */*/*.egg; do echo "${egg}: $(csi -R srfi-197 -p '(chain (read) (alist-ref '"'"'version _ eq? '"'"'(#f)) (car _) ((lambda (v) (cond ((string? v) "string") ((number? v) "number") (else v))) _))' < "${egg}")"; done | less | rg -vw '(string|#f)$'
crypt/1.0/crypt.egg: number

Error: unterminated list

	Call history:

	<syntax>	  (##core#begin (##core#if (string? v) (##core#begin "string") (##core#if (number? v) (##core#begin "n...
	<syntax>	  (##core#if (string? v) (##core#begin "string") (##core#if (number? v) (##core#begin "number") (##cor...
	<stdin>:1	  (string? v)
	<syntax>	  (##core#begin "string")
	<syntax>	  (##core#if (number? v) (##core#begin "number") (##core#begin v))
	<stdin>:1	  (number? v)
	<syntax>	  (##core#begin "number")
	<syntax>	  (##core#begin v)
	<syntax>	  (car chain-var60488)
	<syntax>	  (alist-ref (quote version) chain-var60477 eq? (quote (#f)))
	<stdin>:1	  (quote version)
	<stdin>:1	  (##core#quote version)
	<stdin>:1	  (quote (#f))
	<stdin>:1	  (##core#quote (#f))
	<stdin>:1	  (read)	<--
math/0.2.2/math.egg:

Error: unterminated list

	Call history:

	<syntax>	  (##core#begin (##core#if (string? v) (##core#begin "string") (##core#if (number? v) (##core#begin "n...
	<syntax>	  (##core#if (string? v) (##core#begin "string") (##core#if (number? v) (##core#begin "number") (##cor...
	<stdin>:1	  (string? v)
	<syntax>	  (##core#begin "string")
	<syntax>	  (##core#if (number? v) (##core#begin "number") (##core#begin v))
	<stdin>:1	  (number? v)
	<syntax>	  (##core#begin "number")
	<syntax>	  (##core#begin v)
	<syntax>	  (car chain-var60488)
	<syntax>	  (alist-ref (quote version) chain-var60477 eq? (quote (#f)))
	<stdin>:1	  (quote version)
	<stdin>:1	  (##core#quote version)
	<stdin>:1	  (quote (#f))
	<stdin>:1	  (##core#quote (#f))
	<stdin>:1	  (read)	<--
message-digest-utils/4.2.2/message-digest-utils.egg:
monad/5.0/monad.egg: number
postgresql/4.0.0/postgresql.egg: 4.0.0
postgresql/4.1.0/postgresql.egg: 4.1.0
postgresql/4.1.1/postgresql.egg: 4.1.0
postgresql/4.1.2/postgresql.egg: 4.1.2
postgresql/4.1.3/postgresql.egg: 4.1.3
postgresql/4.1.4/postgresql.egg: 4.1.3
scm2wiki/0.3.1/scm2wiki.egg: 0.3.1
scm2wiki/0.3.2/scm2wiki.egg: 0.3.2
sql-null/2.0/sql-null.egg: number
ws-client/0.2.0/ws-client.egg: number
ws-client/0.2.1/ws-client.egg: 0.2.1
ws-client/1.0.0/ws-client.egg: 0.2.1