rake update[v4-dev]

Author: glebm

assets/javascripts/bootstrap-sprockets.js

@@ -1,11 +1,11 @@
 //= require ./bootstrap/util
-//= require ./bootstrap/tab
-//= require ./bootstrap/collapse
-//= require ./bootstrap/alert
 //= require ./bootstrap/tooltip
 //= require ./bootstrap/popover
 //= require ./bootstrap/dropdown
 //= require ./bootstrap/button
+//= require ./bootstrap/collapse
+//= require ./bootstrap/tab
 //= require ./bootstrap/scrollspy
-//= require ./bootstrap/modal
 //= require ./bootstrap/carousel
+//= require ./bootstrap/modal
+//= require ./bootstrap/alert

assets/stylesheets/bootstrap/_root.scss

@@ -1,16 +1,19 @@
 :root {
+  // Custom variable values only support SassScript inside `#{}`.
   @each $color, $value in $colors {
-    --#{$color}: $value;
+    --#{$color}: #{$value};
   }
 
   @each $color, $value in $theme-colors {
-    --#{$color}: $value;
+    --#{$color}: #{$value};
   }
 
   @each $bp, $value in $grid-breakpoints {
-    --breakpoint-#{$bp}: $value;
+    --breakpoint-#{$bp}: #{$value};
   }
 
-  --font-family-sans-serif: $font-family-sans-serif;
-  --font-family-monospace: $font-family-monospace;
+  // Use `inspect` for lists so that quoted items keep the quotes.
+  // See https://github.com/sass/sass/issues/2383#issuecomment-336349172
+  --font-family-sans-serif: #{inspect($font-family-sans-serif)};
+  --font-family-monospace: #{inspect($font-family-monospace)};
 }

lib/bootstrap/version.rb

@@ -1,4 +1,4 @@
 module Bootstrap
   VERSION       = '4.0.0.beta'
-  BOOTSTRAP_SHA = 'c8ee8509cb72edd2f758398664bed8a0eeeb2dc4'
+  BOOTSTRAP_SHA = 'a9fa21e701536e84789169fec6a1f4a0f821ee3c'
 end