gnu: Add julia-weakrefstrings.

* gnu/packages/julia-xyz.scm (julia-weakrefstrings-0.6.1): New variable.

gnu/packages/julia-xyz.scm

@@ -2046,3 +2046,24 @@ and root finding over dense univariate polynomials.")
     (description "Julia math with 85+ accurate bits.  Extended precision float
 and complex types.")
     (license license:expat)))
+
+(define-public julia-weakrefstrings
+  (package
+    (name "julia-weakrefstrings")
+    (version "0.6.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/JuliaData/WeakRefStrings.jl")
+             (commit (string-append "v" version))))
+       (file-name "WeakRefStrings")
+       (sha256
+        (base32 "00sfqhw2niarfmpn8i3dmv5dfhyj3bylvwp4yrq77b560g997khh"))))
+    (build-system julia-build-system)
+    (home-page "https://github.com/JuliaData/WeakRefStrings.jl")
+    (synopsis "String type for Julia that allows efficient string
+representation and transfer")
+    (description "Minimal String type for Julia that allows for efficient
+string representation and transfer.")
+    (license license:expat)))