testing: add Coverage (CL 98150043)
testing: add TestMain support (CL 148770043)
text/scanner: add IsIdentRune field of Scanner. (CL 108030044)
+text/template: allow comparison of signed and unsigned integers (CL 149780043)
time: use the micro symbol (ยต (U+00B5)) to print microsecond duration (CL 105030046)
encoding/asn1: optional elements with a default value will now only be omitted if they have that value (CL 86960045).