Adds cascading contextual alternates for case-sensitive delimiters

docs/lab/index.html

@@ -141,6 +141,13 @@ x<-4  x < -4  x<-y
 1.2  34.56.78.90.12
 A*Y V*V W*W N*N X*X
 Λ*Λ Σ*Σ Δ*Δ Y*Y &*
+
+calt case should cascade:
+U() U[] U{}  — rightx should be rightx.case
+()U []U {}U  — special-cased as "delim' delim -> delim.case"
+U---  — all hyphens should be hyphen.case
+---U  — only the hyphen next to U should be hyphen.case
+U-→(){}[]*
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 // From http://justanotherfoundry.com/generator
@@ -157,6 +164,8 @@ samples.set('Latin extended', `
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+
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 samples.set('Combi base glyphs (top 200)', `