fix: add support for context sensitive readers

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

readerio/generic/eq.go

@@ -0,0 +1,22 @@
+package generic
+
+import (
+	EQ "github.com/ibm/fp-go/eq"
+	G "github.com/ibm/fp-go/internal/eq"
+)
+
+// Eq implements the equals predicate for values contained in the IO monad
+func Eq[GEA ~func(R) GIOA, GIOA ~func() A, R, A any](e EQ.Eq[A]) func(r R) EQ.Eq[GEA] {
+	// comparator for the monad
+	eq := G.Eq(
+		MonadMap[GEA, func(R) func() func(A) bool, GIOA, func() func(A) bool, R, A, func(A) bool],
+		MonadAp[GEA, func(R) func() bool, func(R) func() func(A) bool],
+		e,
+	)
+	// eagerly execute
+	return func(ctx R) EQ.Eq[GEA] {
+		return EQ.FromEquals(func(l, r GEA) bool {
+			return eq(l, r)(ctx)()
+		})
+	}
+}