feat: build and test on 32-bit targets (386, arm)

.github/workflows/ci.yml

@@ -87,6 +87,8 @@ jobs:
           - { goarch: loong64, qemu: qemu-loongarch64-static }
           - { goarch: ppc64le, qemu: qemu-ppc64le-static }
           - { goarch: s390x,   qemu: qemu-s390x-static }
+          # 32-bit: int is 32 bits.
+          - { goarch: arm,     qemu: qemu-arm-static }
     steps:
       - uses: actions/checkout@v7
       - uses: actions/setup-go@v7
@@ -98,6 +100,25 @@ jobs:
           GOOS=linux GOARCH=${{ matrix.goarch }} go vet -tags rbgo_core ./...
           GOARCH=${{ matrix.goarch }} go test -tags rbgo_core -short -exec=${{ matrix.qemu }} ./...
 
+  # 386 runs natively on the amd64 runner (the kernel executes 32-bit x86
+  # binaries), not under qemu-i386, whose emulation loses x87/SSE state across
+  # preemption.
+  arch-386:
+    name: arch 386
+    runs-on: ubuntu-latest
+    env:
+      CGO_ENABLED: "0"
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
+        with:
+          go-version: '1.27.3'
+      - name: Vet + test (GOARCH=386), both builds
+        run: |
+          GOARCH=386 go vet ./...
+          GOARCH=386 go test ./...
+          GOARCH=386 go test -tags rbgo_core ./...
+
   cross:
     name: compile on every target rbgo builds for
     runs-on: ubuntu-latest
@@ -110,7 +131,7 @@ jobs:
         shell: bash
         run: |
           fail=0
-          for t in linux/amd64 linux/arm64 linux/riscv64 linux/loong64 linux/ppc64le linux/s390x \
+          for t in linux/amd64 linux/arm64 linux/riscv64 linux/loong64 linux/ppc64le linux/s390x linux/386 linux/arm \
                    darwin/amd64 darwin/arm64 windows/amd64 windows/arm64 wasip1/wasm js/wasm; do
             os=${t%/*}; arch=${t#*/}
             for tags in "" rbgo_core; do

README.md

@@ -455,8 +455,9 @@ go-notebook.
 rbgo builds with or without its gem bindings; `-tags rbgo_core` leaves the
 gems out (the language and the numeric stack only), which is what a notebook
 worker or a browser page wants. These bindings work, and are tested, on both.
-rbgo compiles for linux, darwin and windows on 64-bit targets and for wasm
-(js and wasip1), and so does this module.
+rbgo compiles for linux, darwin and windows on 64-bit targets, for 32-bit
+linux (`386`, `arm`) and for wasm (js and wasip1), and so does this module.
+CI runs the suite natively on `386` and under QEMU on 32-bit `arm`.
 
 ## License
 

go.mod

@@ -4,7 +4,7 @@ go 1.27.2
 
 require (
 	github.com/go-dataframe/dataframe v0.1.0
-	github.com/go-embedded-ruby/ruby v0.8.0
+	github.com/go-embedded-ruby/ruby v0.8.2
 	github.com/go-ndarray/ndarray v0.12.0
 	github.com/go-numerics/integrate v0.2.0
 	github.com/go-numerics/optimize v0.2.0
@@ -147,7 +147,7 @@ require (
 	github.com/go-ruby-capistrano/capistrano v0.0.0-20260927173236-3b90af3c6888 // indirect
 	github.com/go-ruby-capybara/capybara v0.0.0-20260910084630-0731c9ea8d6d // indirect
 	github.com/go-ruby-cgi/cgi v0.0.0-20260916091525-3d328d3ff447 // indirect
-	github.com/go-ruby-chronic/chronic v0.0.0-20260916091614-bd47d560b6f4 // indirect
+	github.com/go-ruby-chronic/chronic v0.1.0 // indirect
 	github.com/go-ruby-cmath/cmath v0.0.0-20260916091648-4963ab4145f7 // indirect
 	github.com/go-ruby-concurrent-ruby/concurrent-ruby v0.0.0-20260916091840-b820f7a57284 // indirect
 	github.com/go-ruby-confd/confd v0.0.0-20260825131031-1ac780d51c57 // indirect

go.sum

@@ -204,8 +204,8 @@ github.com/go-dataframe/dataframe v0.1.0 h1:l92liqTQ/StH5rurH2ipgvXunMbtCJAkDNWE
 github.com/go-dataframe/dataframe v0.1.0/go.mod h1:rAJdylzFafSOhTAV6z+gSs4i0D9M9XKMKqhWUjIEolk=
 github.com/go-datetime/dates v0.1.0 h1:Uj8TaTZ09DXdq75EGQ/teFdrXpfVAC3ZDHAPQvPTnaA=
 github.com/go-datetime/dates v0.1.0/go.mod h1:KeZ1wUeMScJD6HOvj3hINwbsB+GCSFjJLWcJhrBlwIo=
-github.com/go-embedded-ruby/ruby v0.8.0 h1:09E9fzAQutBwsfBR7Sm3aAEmeYiG+I6JQBzVTdiSxE8=
-github.com/go-embedded-ruby/ruby v0.8.0/go.mod h1:g7gQohmhj96s4qiaoTtFTa2Hbfbnh0QTQej1w81LxOE=
+github.com/go-embedded-ruby/ruby v0.8.2 h1:vj4a+NJBb7Ou6MaBWARMEdacYtnEK7NHS2Wq1Guqr9U=
+github.com/go-embedded-ruby/ruby v0.8.2/go.mod h1:6g5bwN6eYV00ctKi3XxhXggPxBV37PGaucMFf3LFLZc=
 github.com/go-encryptions/unixcrypt v0.1.0 h1:XWk4h9uCDd+T2hovOzgO0B2vOdJvAwi9nbOBVb3o62c=
 github.com/go-encryptions/unixcrypt v0.1.0/go.mod h1:B1dJSjz3kdxvP7cpi5xSzyxezgBijmtNCUeCKqqDd3o=
 github.com/go-facter/facter v0.0.0-20260830120958-454b72e642ab h1:bXPxQDhADpiF/S/8jlRFhVisFPRaxPtPgjibLnOzvsE=
@@ -339,8 +339,8 @@ github.com/go-ruby-capybara/capybara v0.0.0-20260910084630-0731c9ea8d6d h1:eDH85
 github.com/go-ruby-capybara/capybara v0.0.0-20260910084630-0731c9ea8d6d/go.mod h1:igWLNrYKtKkssHOzlXm1YFoPH0Yi6LGazOSA4Obo6T0=
 github.com/go-ruby-cgi/cgi v0.0.0-20260916091525-3d328d3ff447 h1:o6V4n2Td46cjbCwPN0pZnUVFfHbC648AnYtMQVU9O60=
 github.com/go-ruby-cgi/cgi v0.0.0-20260916091525-3d328d3ff447/go.mod h1:TAIxiFMAj68dWClzEmDY1vCSNFiPfupD3HRADRXrkZw=
-github.com/go-ruby-chronic/chronic v0.0.0-20260916091614-bd47d560b6f4 h1:Z2aDUPl3f6fQIJ4Y+9KCE16p77dAxJBBJjR3j974A5o=
-github.com/go-ruby-chronic/chronic v0.0.0-20260916091614-bd47d560b6f4/go.mod h1:6H3V0VdtD8NB/WEt+8+bIM0n78g45H8HDAnWNwJByCM=
+github.com/go-ruby-chronic/chronic v0.1.0 h1:3rar6r+rLVFNmyGpTPZvMbjEnnRh9JI2vNI11048A70=
+github.com/go-ruby-chronic/chronic v0.1.0/go.mod h1:hhudekjG06iXIHV99juSwG+aOJ+Jv7dNS7tLzEX8ywg=
 github.com/go-ruby-cmath/cmath v0.0.0-20260916091648-4963ab4145f7 h1:2tUvNHeR8mL8NcJyxTZxaaujvusucfBsnZAQg18D9Zg=
 github.com/go-ruby-cmath/cmath v0.0.0-20260916091648-4963ab4145f7/go.mod h1:djGUM2WR7AdnZqeRg/OQ4xVzmsl8PAWQKILX2n/foas=
 github.com/go-ruby-concurrent-ruby/concurrent-ruby v0.0.0-20260916091840-b820f7a57284 h1:hIdCXEwLLYl+NPKBCbI3aFul6ARXfgEczxlA0hIDOkY=