str(Queryset.query) does not properly encapsulate values

[Ryan Gartin]

Expectation: print(str(qs.query)) will output correctly formatted SQL, ready to copy/paste, and execute.

Bug: Values such as dates, uuids are not encapsulated with single quotes. ArrayFields are incorrectly outputted. When debugging large queries, it is a pain to have to modify every output manually in order to successfully execute query outside of Django application.

Environment: Django 2.2.5, PostgreSQL 10.5, x86_64-apple-darwin14.5.0. Tested on PostgreSQL 9.6 as well.
Note: I was debugging earlier in the year on Django 2.0 and 2.1 and I feel that this was not an issue in those version.

Example INCORRECT Output:
print(str(qs.query))
SELECT .... FROM stuff
WHERE "asdf"."end" <= 2019-09-21 02:48:43.856895+00:00
AND "asdf"."start" >= 2019-09-21 02:48:43.856895+00:00
AND "asdf"."uuid" = 854af4a2-cb2a-4b22-ae04-90f14aa86ddd
AND "asdf"."qwerty" BETWEEN 1989-09-20 20:12:45.927138+00:00 AND 2001-09-20 18:03:09.927151+00:00
AND "asdf"."gender" IN (f)
AND "asdf"."letter" @> ['a']::VARCHAR(1)[]

FIX:
Dates and uuid must be single quoted.
CHARFIELD "EQUAL" query needs to be single quoted = 'a'
CHARFIELD "IN" query needs to be single quoted IN ('a', 'b', 'c').
ARRAYFIELD (aka character varying [] {1} ) "IN" query should be in single quoted, encased in brackets, no quotes on individual characters @> '{a,b,c}'

[Claude Paroz]

Duplicate of #29891