diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 14159b7..50b5427 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -1,50 +1,229 @@
-# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
-# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
 on:
-  push:
-    branches: [main, master]
-  pull_request:
-    branches: [main, master]
+  workflow_call:
+    inputs:
+      extra-packages:
+        type: string
+        default: ""
+        required: false
+      cache-version:
+        type: string
+        default: "2"
+        required: false
+      pandoc-version:
+        type: string
+        default: "3.x"
+        required: false
+      extra-check-args:
+        type: string
+        # default: '"--run-donttest", "--no-manual", "--as-cran"'
+        default: "NULL"
+        required: false
+      macOS:
+        type: string
+        default: "macOS-latest"
+        required: false
+      windows:
+        type: string
+        default: "windows-latest"
+        required: false
+      ubuntu:
+        type: string
+        required: false
+        # To test more versions, they must be separated by a space. Ex: `"ubuntu-18.04 ubuntu-20.04`
+        default: "ubuntu-20.04"
+      minimum-r-version:
+        type: string
+        required: false
+        default: ""
+      force-windows-src:
+        type: boolean
+        required: false
+        default: false
+      rtools-35:
+        type: boolean
+        default: true
+        required: false
+      rtools-40:
+        type: boolean
+        default: true
+        required: false
 
 name: R-CMD-check
 
 jobs:
+  setup:
+    name: setup
+    runs-on: ubuntu-latest
+    outputs:
+      config: ${{ steps.config.outputs.config }}
+    steps:
+      # - name: devel
+      #   id: devel
+      #   uses: r-lib/actions/setup-r@v2
+      #   with:
+      #     r-version: devel
+      #     install-r: false
+
+      - name: release
+        id: release
+        uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: release
+          install-r: false
+
+      - name: oldrel-1
+        id: oldrel-1
+        uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: oldrel-1
+          install-r: false
+
+      - name: oldrel-2
+        id: oldrel-2
+        uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: oldrel-2
+          install-r: false
+
+      - name: oldrel-3
+        id: oldrel-3
+        uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: oldrel-3
+          install-r: false
+
+      - name: oldrel-4
+        id: oldrel-4
+        uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: oldrel-4
+          install-r: false
+
+      - name: Checkout GitHub repo
+        uses: rstudio/shiny-workflows/.github/internal/checkout@v1
+
+      # R is a pre-installed software
+      - name: Config
+        id: config
+        shell: Rscript {0}
+        run: |
+          mac <- "${{ inputs.macOS }}"
+          windows <- "${{ inputs.windows }}"
+          ubuntu <- strsplit("${{ inputs.ubuntu }}", "[[:space:],]+")[[1]]
+          has_src <- dir.exists("src")
+          min_r_ver <- "${{ inputs.minimum-r-version }}"
+          test_on_rtools35 <- identical("${{ inputs.rtools-35 }}", "true")
+          test_on_rtools40 <- identical("${{ inputs.rtools-40 }}", "true")
+          force_windows_src <- identical("${{ inputs.force-windows-src }}", "true")
+          if (force_windows_src) has_src <- TRUE
+
+          rver <- list(
+            # devel   = "${{ steps.devel.outputs.installed-r-version }}",
+            # When R 4.3 was released, R version 4.4.0 was not recognized.
+            # However, `"devel"` is recognized within `r-lib/actions/setup-r`.
+            devel   = "devel",
+            release = "${{ steps.release.outputs.installed-r-version }}",
+            oldrel1 = "${{ steps.oldrel-1.outputs.installed-r-version }}",
+            oldrel2 = "${{ steps.oldrel-2.outputs.installed-r-version }}",
+            oldrel3 = "${{ steps.oldrel-3.outputs.installed-r-version }}",
+            oldrel4 = "${{ steps.oldrel-4.outputs.installed-r-version }}"
+          )
+          job <- function(os, r, ...) {
+            list(os = os, r = r, ...)
+          }
+          is_valid_os <- function(os, r_ver = "") {
+            if (identical(os, "false")) return(FALSE)
+            if (identical(os, "")) return(FALSE)
+            if (any(nchar(c(r_ver, min_r_ver)) == 0)) return(TRUE)
+            if (identical(r_ver, "devel")) return(TRUE)
+            r_ver >= min_r_ver
+          }
+          config <- c(
+            list(
+              if (is_valid_os(mac, rver$release))                             job(mac, rver$release),
+              if (has_src && is_valid_os(windows, "devel"))                   job(windows, "devel", "rtools-version" = "44"),
+              if (is_valid_os(windows, rver$release))                         job(windows, rver$release, "rtools-version" = "43"),
+              if (has_src && is_valid_os(windows, "4.2"))                     job(windows, "4.2", "rtools-version" = "42"),
+              if (has_src && test_on_rtools40 && is_valid_os(windows, "4.1")) job(windows, "4.1"),
+              if (has_src && test_on_rtools35 && is_valid_os(windows, "3.6")) job(windows, "3.6"),
+              if (is_valid_os(ubuntu, rver$devel))                            job(ubuntu[[1]], rver$devel, "http-user-agent" = "release")
+            ),
+            if (is_valid_os(ubuntu))
+              unlist(recursive = FALSE, lapply(ubuntu, function(ubuntu_) {
+                list(
+                  if (is_valid_os(ubuntu_, rver$release)) job(ubuntu_, rver$release),
+                  if (is_valid_os(ubuntu_, rver$oldrel1)) job(ubuntu_, rver$oldrel1),
+                  if (is_valid_os(ubuntu_, rver$oldrel2)) job(ubuntu_, rver$oldrel2),
+                  if (is_valid_os(ubuntu_, rver$oldrel3)) job(ubuntu_, rver$oldrel3),
+                  if (is_valid_os(ubuntu_, rver$oldrel4)) job(ubuntu_, rver$oldrel4)
+                )
+              }))
+          )
+          ## Drop NULLs
+          config <- config[!vapply(config, is.null, logical(1))]
+          ## Convert to JSON manually to save 10s installing `jsonlite`
+          join_and_wrap <- function(x, start, end, sep = ",") {
+            paste0(start, paste0(x, collapse = sep), end)
+          }
+          entries_json <- vapply(config, character(1), FUN = function(entry) {
+            join_and_wrap(
+              paste0("\"", names(entry), "\":\"", unname(entry), "\""),
+              "{", "}"
+            )
+          })
+          config_json <- join_and_wrap(entries_json, "[", "]")
+          cat("Config:\n", config_json, "\n", sep = "")
+          cat("config=", config_json, "\n", file = Sys.getenv("GITHUB_OUTPUT"), sep = "", append = TRUE)
+
   R-CMD-check:
     runs-on: ${{ matrix.config.os }}
 
     name: ${{ matrix.config.os }} (${{ matrix.config.r }})
 
+    needs: [setup]
     strategy:
       fail-fast: false
       matrix:
-        config:
-          - {os: macos-latest,   r: 'release'}
-          - {os: windows-latest, r: 'release'}
-          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
-          - {os: ubuntu-latest,   r: 'release'}
-          - {os: ubuntu-latest,   r: 'oldrel-1'}
+        config: ${{ fromJSON(needs.setup.outputs.config) }}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
-      R_KEEP_PKG_SOURCE: yes
 
     steps:
-      - uses: actions/checkout@v4
-
-      - uses: r-lib/actions/setup-pandoc@v2
+      - name: Checkout GitHub repo
+        uses: rstudio/shiny-workflows/.github/internal/checkout@v1
 
-      - uses: r-lib/actions/setup-r@v2
+      - name: Install R, system dependencies, and package dependencies
+        uses: rstudio/shiny-workflows/setup-r-package@v1
         with:
+          rtools-version: ${{ matrix.config.rtools-version }}
+          pandoc-version: ${{ inputs.pandoc-version }}
           r-version: ${{ matrix.config.r }}
           http-user-agent: ${{ matrix.config.http-user-agent }}
-          use-public-rspm: true
+          cache-version: ${{ inputs.cache-version }}
+          needs: check
+          extra-packages: |
+            any::rcmdcheck
+            ${{ inputs.extra-packages }}
 
-      - uses: r-lib/actions/setup-r-dependencies@v2
+      - name: Check package
+        uses: r-lib/actions/check-r-package@v2
+        timeout-minutes: 30
         with:
-          extra-packages: any::rcmdcheck
-          needs: check
+          check-dir: '"check"' # matches directory below
+          args: 'c(${{ inputs.extra-check-args }}, "--no-manual", "--as-cran")'
 
-      - uses: r-lib/actions/check-r-package@v2
+      - name: "Show `testthat` output"
+        if: always()
+        run: find check -name 'testthat.Rout*' -exec cat '{}' \; || true
+        shell: bash
+      - name: "Show install logs"
+        if: always()
+        run: find check -name '00install.out' -exec cat '{}' \; || true
+        shell: bash
+      - name: "Upload 'Check package' results"
+        if: failure()
+        uses: actions/upload-artifact@main
         with:
-          upload-snapshots: true
-          build_args: 'c("--no-manual","--compact-vignettes=gs+qpdf")'
+          name: ${{ matrix.config.os }}-r${{ matrix.config.r }}-results
+          path: "check"
diff --git a/README.Rmd b/README.Rmd
index 0b50a80..45d650c 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -22,7 +22,7 @@ knitr::opts_chunk$set(
 <!-- badges: end -->
 
 
-The goal of lzstringr is to provide an R wrapper for the [lzstring C++ library](https://github.com/andykras/lz-string-cpp). [lzstring](https://github.com/pieroxy/lz-string) is originally a JavaScript library that provides fast and efficient string compression and decompression using a [LZ-based algorithm](https://en.wikipedia.org/wiki/Lempel–Ziv–Welch). Credit goes to [Winston Chang](https://github.com/wch) for spotting this missing R package and doing the majority of the work over at the R Shinylive repo—check out his awesome contributions which this repo is based on [here](https://github.com/posit-dev/r-shinylive/issues/70) and [here](https://github.com/posit-dev/r-shinylive/pull/71). Also, shoutout to Andy Kras for his implementation in C++ of lzstring, which you can find right [here](https://github.com/andykras/lz-string-cpp), and [pieroxy](https://github.com/pieroxy), the original brain behind lzstring in JavaScript—peek at his work over [here](https://github.com/pieroxy/lz-string). 
+The goal of lzstringr is to provide an R wrapper for the [lzstring C++ library](https://github.com/andykras/lz-string-cpp). [lzstring](https://github.com/pieroxy/lz-string) is originally a JavaScript library that provides fast and efficient string compression and decompression using a [LZ-based algorithm](https://en.wikipedia.org/wiki/Lempel–Ziv–Welch). Credit goes to [Winston Chang](https://github.com/wch) for spotting this missing R package and guiding me over at the R Shinylive repo—check out his awesome contributions which this repo is based on [here](https://github.com/posit-dev/r-shinylive/issues/70) and [here](https://github.com/posit-dev/r-shinylive/pull/71). Also, shoutout to Andy Kras for his implementation in C++ of lzstring, which you can find right [here](https://github.com/andykras/lz-string-cpp), and [pieroxy](https://github.com/pieroxy), the original brain behind lzstring in JavaScript—peek at his work over [here](https://github.com/pieroxy/lz-string). 
 
 ## Installation
 
diff --git a/README.md b/README.md
index 871f8ab..c640462 100644
--- a/README.md
+++ b/README.md
@@ -15,8 +15,8 @@ JavaScript library that provides fast and efficient string compression
 and decompression using a [LZ-based
 algorithm](https://en.wikipedia.org/wiki/Lempel–Ziv–Welch). Credit goes
 to [Winston Chang](https://github.com/wch) for spotting this missing R
-package and doing the majority of the work over at the R Shinylive
-repo—check out his awesome contributions which this repo is based on
+package and guiding me over at the R Shinylive repo—check out his
+awesome contributions which this repo is based on
 [here](https://github.com/posit-dev/r-shinylive/issues/70) and
 [here](https://github.com/posit-dev/r-shinylive/pull/71). Also, shoutout
 to Andy Kras for his implementation in C++ of lzstring, which you can