Add example to try and reproduce failure.

examples/pgfault/config.ru

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+require 'pg'
+
+run do |env|
+	connection = PG.connect(dbname: 'test')
+	connection.close
+
+	[200, {"Content-Type" => "text/plain"}, ["Hello, World!"]]
+end

examples/pgfault/falcon.rb

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+
+require 'pg'
+require 'falcon/environment/rack'
+
+connection = PG.connect(dbname: 'test')
+pp connection
+connection.close
+
+service "hello.localhost" do
+	include Falcon::Environment::Rack
+end

examples/pgfault/gems.locked

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    async (2.11.0)
+      console (~> 1.25, >= 1.25.2)
+      fiber-annotation
+      io-event (~> 1.5, >= 1.5.1)
+      timers (~> 4.1)
+    async-container (0.18.2)
+      async (~> 2.10)
+    async-http (0.66.3)
+      async (>= 2.10.2)
+      async-pool (>= 0.6.1)
+      io-endpoint (~> 0.10, >= 0.10.3)
+      io-stream (~> 0.4)
+      protocol-http (~> 0.26.0)
+      protocol-http1 (~> 0.19.0)
+      protocol-http2 (~> 0.17.0)
+      traces (>= 0.10.0)
+    async-http-cache (0.4.3)
+      async-http (~> 0.56)
+    async-pool (0.6.1)
+      async (>= 1.25)
+    async-service (0.12.0)
+      async
+      async-container (~> 0.16)
+    console (1.25.2)
+      fiber-annotation
+      fiber-local (~> 1.1)
+      json
+    falcon (0.47.6)
+      async
+      async-container (~> 0.18)
+      async-http (~> 0.66, >= 0.66.3)
+      async-http-cache (~> 0.4.0)
+      async-service (~> 0.10)
+      bundler
+      localhost (~> 1.1)
+      openssl (~> 3.0)
+      process-metrics (~> 0.2.0)
+      protocol-rack (~> 0.5)
+      samovar (~> 2.3)
+    fiber-annotation (0.2.0)
+    fiber-local (1.1.0)
+      fiber-storage
+    fiber-storage (0.1.0)
+    io-endpoint (0.10.3)
+    io-event (1.5.1)
+    io-stream (0.4.0)
+    json (2.7.2)
+    localhost (1.3.1)
+    mapping (1.1.1)
+    openssl (3.2.0)
+    pg (1.5.6)
+    process-metrics (0.2.1)
+      console (~> 1.8)
+      samovar (~> 2.1)
+    protocol-hpack (1.4.3)
+    protocol-http (0.26.5)
+    protocol-http1 (0.19.1)
+      protocol-http (~> 0.22)
+    protocol-http2 (0.17.0)
+      protocol-hpack (~> 1.4)
+      protocol-http (~> 0.18)
+    protocol-rack (0.5.1)
+      protocol-http (~> 0.23)
+      rack (>= 1.0)
+    rack (3.0.11)
+    samovar (2.3.0)
+      console (~> 1.0)
+      mapping (~> 1.0)
+    timers (4.3.5)
+    traces (0.11.1)
+
+PLATFORMS
+  arm64-darwin-22
+
+DEPENDENCIES
+  falcon
+  pg
+
+BUNDLED WITH
+   2.5.9

examples/pgfault/gems.rb

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+source "https://rubygems.org"
+
+gem "pg"
+gem "falcon"