manual.yml: remove contingent tests

Also clarify non-prescriptive nature of some tests in jq.test

tests/jq.test

@@ -1814,12 +1814,17 @@ abs
 "abc"
 
 map(abs)
-[-10, -1.1, -1e-1, 1000000000000000002]
-[10,1.1,0.1,1000000000000000002]
+[-0, 0, -10, -1.1]
+[0,0,10,1.1]
 
-map(fabs == length) | unique[0]
-[-10, -1.1, -1e-1, 1000000000000000002, -1000000000000000002]
-true
+map(fabs == length) | unique
+[-10, -1.1, -1e-1, 1000000000000000002]
+[true]
+
+# The following is NOT prescriptive:
+map(abs)
+[0.1,1000000000000000002]
+[1e-1, 1000000000000000002]
 
 # Using a keyword as variable/label name
 

tests/man.test

@@ -189,8 +189,8 @@ null
 -1
 
 map(abs)
-[-10, -1.1, -1e-1, 1000000000000000002, -1000000000000000002]
-[10,1.1,1e-1,10000000000000002,1e+18]
+[-10, -1.1, -1e-1]
+[10,1.1,1e-1]
 
 .[] | length
 [[1,2], "string", {"a":2}, null, -5]