[v6.d REVIEW] Formatting fixes

- Toss Perl-5-ism and useless variables
- Improve test descriptions

Orig: 8650ef2

Author: zoffixznet

S02-types/instants-and-durations.t

@@ -41,13 +41,11 @@ throws-like { Instant.new(123) }, X::Cannot::New, 'Instant.new is illegal';
     is $t0 + ($t1 - $t0), $t1, 'Instant A + (Instant B - Instant A) == Instant B';
 }
 
-{
-    for (-2**63, -400.2, -33/7, -1, 0, 1, 33/7, 400.2, 2**32, ) -> $e {
-        my $i = Instant.from-posix($e, False);
-        is $i.perl.EVAL, $i, 'Instant round trips properly';
-        my $i = Instant.from-posix($e, True);
-        is $i.perl.EVAL, $i, 'Instant round trips properly';
-    }
+for -2**63, -400.2, -33/7, -1, 0, 1, 33/7, 400.2, 2**32 -> $e {
+    is-deeply .perl.EVAL, $_, "Instant round trips properly .($e, False)"
+        with Instant.from-posix: $e, False;
+    is-deeply .perl.EVAL, $_, "Instant round trips properly .($e, True)"
+        with Instant.from-posix: $e, True;
 }
 
 # RT #132006