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pip install silently consenting to install wrong version

See original GitHub issue

Environment

pip version: 10.0.1
Python version: 2.7.15rc1
OS: Ubuntu 18.04
Package: django-wiki, a Python 3+ release (0.4+), previously supporting Python 2.7+

Description

Dear great maintainers, I think I have found a small issue:

pip install wiki --pre # results in 0.3.1 - THIS IS OKAY
pip install wiki --upgrade --pre # results in 0.3.1 - THIS IS OKAY
pip install wiki==0.4a4 # results in 0.3.1 - THIS IS PROBLEMATIC
pip install wiki==0.4a5 # results in 0.4a4 - THIS IS REALLY WEIRD

Expected behavior

Hard failure when installing a py3-only release on py2.

Never to somehow end up with 0.4a4, which is also py3-only!

How to Reproduce

Use above commands

Output

Installing ==0.4a4, gives 0.3.1

➜  wikitest pip uninstall wiki         
Uninstalling wiki-0.3.1:
  Would remove:
    /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages/wiki-0.3.1.dist-info/*
    /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages/wiki/*
Proceed (y/n)? y
  Successfully uninstalled wiki-0.3.1
➜  wikitest pip install wiki==0.4a4
Collecting wiki==0.4a4
Requirement already satisfied: sorl-thumbnail<13,>=12 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a4) (12.4.1)
Requirement already satisfied: django-mptt<0.10,>=0.9 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a4) (0.9.0)
Requirement already satisfied: django-nyt<1.2,>=1.1b1 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a4) (1.1b2)
Requirement already satisfied: Django<2.1,>=1.11 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a4) (1.11.14)
Requirement already satisfied: django-sekizai>=0.10 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a4) (0.10.0)
Collecting bleach<2,>=1.5 (from wiki==0.4a4)
  Using cached https://files.pythonhosted.org/packages/33/70/86c5fec937ea4964184d4d6c4f0b9551564f821e1c3575907639036d9b90/bleach-1.5.0-py2.py3-none-any.whl
Requirement already satisfied: Pillow in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a4) (5.2.0)
Requirement already satisfied: Markdown<2.7,>=2.6 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a4) (2.6.11)
Requirement already satisfied: django-js-asset in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from django-mptt<0.10,>=0.9->wiki==0.4a4) (1.1.0)
Requirement already satisfied: pytz in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from Django<2.1,>=1.11->wiki==0.4a4) (2018.5)
Requirement already satisfied: django-classy-tags>=0.3.1 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from django-sekizai>=0.10->wiki==0.4a4) (0.8.0)
Requirement already satisfied: six in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from bleach<2,>=1.5->wiki==0.4a4) (1.11.0)
Collecting html5lib!=0.9999,!=0.99999,<0.99999999,>=0.999 (from bleach<2,>=1.5->wiki==0.4a4)
Installing collected packages: html5lib, bleach, wiki
  Found existing installation: html5lib 1.0.1
    Uninstalling html5lib-1.0.1:
      Successfully uninstalled html5lib-1.0.1
  Found existing installation: bleach 2.1.3
    Uninstalling bleach-2.1.3:
      Successfully uninstalled bleach-2.1.3
Successfully installed bleach-1.5.0 html5lib-0.9999999 wiki-0.3.1

Installing ==0.4a5, gives 0.4a4

➜  wikitest pip install wiki==0.4a5
Collecting wiki==0.4a5
Requirement already satisfied: sorl-thumbnail<13,>=12 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a5) (12.4.1)
Requirement already satisfied: django-mptt<0.10,>=0.9 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a5) (0.9.0)
Requirement already satisfied: django-nyt<1.2,>=1.1b1 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a5) (1.1b2)
Requirement already satisfied: Django<2.1,>=1.11 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a5) (1.11.14)
Requirement already satisfied: django-sekizai>=0.10 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a5) (0.10.0)
Collecting bleach<2.2,>=2.1 (from wiki==0.4a5)
  Using cached https://files.pythonhosted.org/packages/30/b6/a8cffbb9ab4b62b557c22703163735210e9cd857d533740c64e1467d228e/bleach-2.1.3-py2.py3-none-any.whl
Requirement already satisfied: Pillow in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a5) (5.2.0)
Requirement already satisfied: Markdown<2.7,>=2.6 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from wiki==0.4a5) (2.6.11)
Requirement already satisfied: django-js-asset in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from django-mptt<0.10,>=0.9->wiki==0.4a5) (1.1.0)
Requirement already satisfied: pytz in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from Django<2.1,>=1.11->wiki==0.4a5) (2018.5)
Requirement already satisfied: django-classy-tags>=0.3.1 in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from django-sekizai>=0.10->wiki==0.4a5) (0.8.0)
Requirement already satisfied: six in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from bleach<2.2,>=2.1->wiki==0.4a5) (1.11.0)
Collecting html5lib!=1.0b1,!=1.0b2,!=1.0b3,!=1.0b4,!=1.0b5,!=1.0b6,!=1.0b7,!=1.0b8,>=0.99999999pre (from bleach<2.2,>=2.1->wiki==0.4a5)
  Using cached https://files.pythonhosted.org/packages/a5/62/bbd2be0e7943ec8504b517e62bab011b4946e1258842bc159e5dfde15b96/html5lib-1.0.1-py2.py3-none-any.whl
Requirement already satisfied: webencodings in /home/user/.virtualenvs/django-wiki-test3/lib/python2.7/site-packages (from html5lib!=1.0b1,!=1.0b2,!=1.0b3,!=1.0b4,!=1.0b5,!=1.0b6,!=1.0b7,!=1.0b8,>=0.99999999pre->bleach<2.2,>=2.1->wiki==0.4a5) (0.5.1)
Installing collected packages: html5lib, bleach, wiki
  Found existing installation: html5lib 0.9999999
    Uninstalling html5lib-0.9999999:
      Successfully uninstalled html5lib-0.9999999
  Found existing installation: bleach 1.5.0
    Uninstalling bleach-1.5.0:
      Successfully uninstalled bleach-1.5.0
  Found existing installation: wiki 0.3.1
    Uninstalling wiki-0.3.1:
      Successfully uninstalled wiki-0.3.1
Successfully installed bleach-2.1.3 html5lib-1.0.1 wiki-0.4a4