Reproduction script for unable to select certain numeric values

example.rb

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"
  # Activate the gem you are reporting the issue against.
  gem "activerecord", "5.0.2"
  gem "pg"
end

require "active_record"
require "minitest/autorun"
require "logger"

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "postgresql", database: "issue_reproduction_development", encoding: "utf8", pool: 5, timeout: 5000, host: "localhost")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :test_models do |t|
    t.numeric :value

    t.timestamps
  end
end

class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true
end

class TestModel < ApplicationRecord
end

class BugTest < Minitest::Test
  def test_numeric_conditions
    TestModel.create!(value: 1.8)
    TestModel.create!(value: 2.6) # Also fails for 0.8 and 0.6??

    assert_equal true, TestModel.exists?(value: '1.8')
    assert_equal true, TestModel.exists?(value: '2.6')

    assert_equal true, TestModel.exists?(value: 1.8)
    assert_equal true, TestModel.exists?(value: 2.6)
  end
end

I run the numbers from 0.0 to 9.9. 100 assertions, 76 failures.
0.0, 0.5, 1.0, 1.5 .. to 9.5 (all increments by 0.5 passed), and these numbers 1.2, 1.3, 1.7, 1.8 also passed.