Migrate CI to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: build
+
+on: [pull_request, push]
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - '3.1'
+          - '3.0'
+          - '2.7'
+          - '2.6'
+          - '2.5'
+          - '2.4'
+          - '2.3'
+          - '2.2'
+          - '2.1'
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - run: bundle exec rake

lib/stupidedi/versions/common/element_types/r.rb

@@ -284,7 +284,9 @@ def to_x12(truncate = true)
               if rounded.zero?
                 "0" * definition.min_length
               else
-                sign + rounded.abs.to_s("F").
+                base = rounded.abs
+                base = base.is_a?(BigDecimal) ? base : BigDecimal(base) 
+                sign + base.to_s("F").
                   gsub(/^0+/, ""). # leading zeros
                   gsub(/0+$/, ""). # trailing zeros
                   gsub(/\.$/, ""). # trailing decimal point